Updates from Kaladesh & Commander 2016. Not much to update on general gameplay, things have been working well. This update is mostly to try out some new cards along with a couple small tweaks.
Swaps
Clever Impersonator to Vesuvan Shapeshifter - Morphs have been a bit stagnant in gameplay because 50% of them are just counterspells, and since there's only 6, you have a reasonable idea of what each one could be. Meanwhile, Clever Impersonator is basically just a clone that can copy 20 extra cards in this stack. By swapping it out for Vesuvan Shapeshifter, I get another interesting morph and nearly the same ability.
Flash Creatures
Angel of Salvation to Selfless Squire - Angel of Salvation has been pretty good in play, but the thing that always felt a bit weak is that it only prevents 5 damage. Selfless Squire forgoes saving creatures for a much bigger effect, along with the ability to stabilize the board on future turns by just being gigantic.
Creatures (and Effective Creatures)
Air Servant to Storm Elemental - I wanted to curb the power of the tap flyers ability a little bit by attaching a cost. Storm Elemental also will give some play to other cards in the stack, like Yet Another Æther Vortex.
Ink-Eyes, Servant of Oni to Noxious Gearhulk - Ink-Eyes is a card that always looks like it should work well in this format, but the reality is that often when you are about to trigger it, you either don't want to (because you have a better creature out), you don't have any targets for the damage trigger, or the defending player will fire off a kill spell once you swap it into play. Noxious Gearhulk will provide an easier two-for-one and add some lifegain to the stack to help you survive.
Savage Knuckleblade to Combustible Gearhulk - Savage Knuckleblade was one of the weaker cards in the stack, as it basically just plays as a hasty 6/6 that can bounce itself. Combustible Gearhulk will have a similar power level in play, but can also put a painful decision to one of your opponents when it enters the battlefield.
Breaker of Armies to Stonehoof Chieftain - Most of the time Breaker wasn't really bigger than the stuff it attacked into, so its must be blocked effect was really a downside. I wanted to try out a bit more of a robust threat in the Chieftain.
Sower of Temptation to Runehorn Hellkite - Sower is basically just a control magic, as the 2/2 flying body doesn't do much most games. I also have a duplicate of the effect in Dragonlord Silumgar. Runehorn Hellkite will add a more powerful flying body along with an effect that can allow you to get back into a game that you're behind in.
Instants
Commandeer to Insidious Will - Insidious Will is basically an upgrade to Commandeer, except in a few edge cases.
Sorceries
Enter the Dungeon to Cruel Entertainment - Enter the Dungeon has to be one of my favorite cards in the stack, but I have to face the fact that it's either never cast or never resolves. Really, it has literally never resolved once since I've built the stack Removing it also gets rid of one of the tutors in my stack, which is a plus. Cruel Entertainment should be an entertaining replacement.
Lands
Yavimaya Hollow to Geier Reach Sanitarium - Yavimaya Hollow is a pretty powerful card once you resolve a creature. It's also spiked up to nearly $20, which is above what I prefer cards to cost in my stack. As such, I'm swapping it out for the Sanitarium, which also helps keep games moving forward.
It feels like Emrakul, the Promised End is stronger than a lot of the creatures you're adding, even though you didn't think it was good enough for your stack. In my stack I also swapped out Extract from Darkness for Breaking // Entering since haste, plus I'd rather only mill myself. Didn't see if you already had it in though.
I agree that Kaladesh isn't very promising for Type 4. Personally, I'm only looking at Noxious Gearhulk myself (@104 spoils), since I don't have tokens in my stack.
Updates from Eldritch Moon and Conspiracy: Take the Crown. The stack has been playing really well lately, with lots of intractive games and no real stalls to speak of. Games also haven't been too quick either. With this update I wanted to provide a bit more hand disruption to prevent a single player from getting way ahead on cards and running away with the game. I also wanted to curb some of the higher power level cards to avoid some of the randomness of the winner being the one who drew the overpowered card.
Flash Creatures
Silumgar Sorcerer to Spell Queller - Will be a bit of an upgrade usually, and will still prevent using a kill spell to get your own spell back. Also allows getting your spell back in certain circumstances (usually wraths).
Wolfir Avenger to Stunt Double - Wolfir Avenger was one of the weaker flash creatures. Stunt double should be a fun replacement.
Creatures (and Effective Creatures)
Nezumi Graverobber to Selvala's Stampede - Nezumi Graverobber is a card I've let slide on power level, since it helped to make sure the game ended. Selvala's Stampede should give 2-3 creatures most times it resolves, which should be a lower powered way to finish the game. Besides, Chainer, Dementia Master is still available as a more balanced version of this effect.
Phyrexian Ingester to Custodi Lich - Ingester was a nice two for one, but Custodi Lich is a three for one, while offering a little more play. It also adds the Monarch mechanic to the stack, which seems like fun.
Phyrexian Metamorph to Lashweed Lurker - I've added another clone to the flash creatures section, and I don't want to have too many clones. Otherwise they can start to get stuck in players' hands. Lashweed Lurker will act as an (usually) uncounterable kill spell, along with a reasonable body.
Bringer of the Red Dawn to Distended Mindbender - Bringer was a bit slow to trigger, needing to survive for an entire turn. It also has a counterpart in Dominus of Fealty. Distended Mindbender should provide some hand disruption that the stack has been largely lacking.
Instants
Last Word to Summary Dismissal - I've added a bunch of uncounterability to the stack, but I wanted to remove a bit in favor of interaction. This also adds another way to counter abilities.
Careful Consideration to Fortune's Favor - Careful Consideration was almost always cast as an instant, so it was usually just a card selection spell. Fortune's Favor should be more interesting and actually provide card advantage.
Chastise to Blessed Alliance - Blessed Alliance offers a little more play without being a targeted removal spell. The life gain usually will be a bit less, but shouldn't be that big of a loss.
Sorceries
Thieves' Auction to Expropriate - Thieves' Auction never was cast very often, and even when it was, it didn't do much. Expropriate should be a very strong replacement.
Necromantic Selection to Capital Punishment - Capital Punishment should still act as a wrath most of the time, but it should have some upside that's less narrow than Necromantic Selection. Also adds a good way to deal with indestructible creatures.
Terminus to Balance - Balance should have a little more play to it than Terminus, while also punishing over-drawing on cards. Also adds a little more land destruction after the last update added more lands.
Artifacts
Mirari to Lich's Mirror - Mirari was a very powerful card, but usually was just a must counter. If it ever resolved, it took over the game. Lich's Mirror is an interesting way to avoid death without the normal consequences of being very far behind. It can also act as a draw 7 if you have a way to kill yourself.
Enchantments
Endless Whispers to Mind's Dilation - Endless Whispers was always a low priority to play since it didn't affect the board immediately, as well as being symmetrical. Mind's Dilation is like another Lurking Predators, but a bit more balanced.
Lich's Mirror is interesting - I hadn't considered how it's much better in this format as you're not behind on land drops when it hits. It also provides some combo potential to be a draw 7 if you can kill yourself.
As for Ethereal Ambush, it's been pretty fun in my stack. It rarely hits 2 creatures, but sometimes when it does it's crazy. It compares favorably to the bottom 50% of flash creatures. It also has a really fun gameplay aspect that most other flash creatures lack.
For Conspiracy 2 spoilers, I'm excited to try out Expropriate, though it might be too powerful in my stack. Capital Punishment also seems like a strong wrath variant and I'm glad that Stunt Double is finally a card. And hopefully I can get 1 or 2 "you become the monarch" cards in my stack, as it sounds like an interesting mechanic for multiplayer.
I feel like Emrakul, the Promised End is probably fine. At the worst you can swing someone else's creature into it as removal, and you'll likely be able to waste more resources than that. At the end of the day, you still aren't actually down a turn, and get a 13/13 flying trampler with protection from instants.
I can also confirm that Confirm Suspicions is strong, but it's not unbeatable or as bad as Overwhelming Intellect ever was. It can also let you better handle annhiliator triggers, along with store cards outside your hand.
Cool stack. You actually designed this with a lot of the same constraints I used for my stack.
I'd probably look to add some utility lands, as they're a great way to add more actions in a turn. Also, I'm surprised you don't have either Leyline of Anticipation or Vedalken Orrery, as they really make things more interesting. If those cost too much, Alchemist's Refuge will at least let you pull some shenanigans once per cycle.
Updates from Oath of the Gatewatch & Shadows over Innistrad, along with some balance fixes. A lot of games were actually going really long, as creatures couldn't stick around long enough to do damage. Also, given the power of some of the recent lands that have been printed, I've decided to remove 5 instants in favor of lands. Once in play, most lands act like instants anyway.
Finally, I've decided to include some Clue token cards in this update, even though I generally don't use tokens, since clues will usually just be cached in for cards immediately.
Swaps
Radiant's Judgment to Blighted Fen - Radiant's Judgement was contributing to creatures not getting through, and thus games taking a long time. Blighted Fen is a least a warning not to attack into it. It can also be played around by having more than one creature in play.
Opportunity to Blighted Cataract - Opportunity again has proven just a bit too strong for my stack. Blighted Cataract is nice uncounterable way to add some card flow.
Second Thoughts to Flamekin Village - Swapping out a removal spell for a way to actually get damage through quicker. I'll be keeping an eye on these two haste lands to make sure they don't lead to less interactive gameplay. While getting damage through is important, I don't want to do it at the expense of people dying out of nowhere.
Capsize to Hall of the Bandit Lord - Same as above. Also, Capsize always drew a lot of agression to the caster, as people hate playing agianst repetative situations. For what it's worth, Hall is the more likely haste land to keep be blanced, as it provides a reasonable downside for the ability.
Ready // Willing to Haunted Fengraf - Ready//Willing never ended up getting cast very often. It was in fact one of the cards that I would always mulligan away in an opening hand. Haunted Fengraf provides a different way to ensure you have a creatures, along with a bit of randomness.
Creatures
Ulamog, the Ceaseless Hunger to Kozilek, the Great Distortion - Ulamog was a reasonable legendary Eldrazi, but it introduced a milling aspect that I didn't really want to be a win condition in this stack. Kozilek is a perfect replacement - a big threat that draws cards, even if it doesn't resolve. If it does resolve, it has a relevant ability and hits even harder than Ulamod did, along with being somewhat unblockable. My only worry is that Kozilek proves too powerful for my stack.
Demon of Death's Gate to Sphinx of the Final Word - Demon of Death's Gate, while a powerful flier that must be answered, often just didn't resolve or was killed by removal or a wrath effect before it did anything. Sphinx of the Final Word should provide a bit more of a sturdy flier that actually gets a chance to have an effect.
Odds // Ends to Geistblast - Wanted to try out another copy effect, as well as add some incidental direct damage. Odds was never really used as a counterspell (or copy) anyway.
Sorceries
Extract from Darkness to Breaking // Entering - Basically a lateral swap, but Breaking//Entering seems like the cooler card and has a bit more play to it. Also wanted to see if the haste could power this up a little.
Artifacts
Blade of Selves to Tamiyo's Journal - Blade seems like a good idea, but in practice it just meant more people had incentive to kill your creature before it was able to attack. Tamiyo's Journal should provide some card advantage at least, with the option to save up clues for a tutor effect. I know I usually avoid tutors in my stack, but delaying 4 turns and skipping 3 card draws to do it seems like a reasonable cost (similar to Enter the Dungeon). In any case, I don't expect it to be used as a tutor most times it's played.
Enchantments
Well of Ideas to Triskaidekaphobia - We played a game with Well of Ideas and it just ended up dragging out the game a really long time. I wanted to try a different board enchantment that would lead to the game ending more quickly.
Hedonist's Trove to Ongoing Investigation - Hedonists Trove was good at ending the game, but it lead to really long turns as there were so many options to go through. Ongoing Investigation should end up being about as strong in the late game, but will come with a downside of clearing out your own graveyard of creatures if you use the life gain. As reanimating a large number of creatures is how many games end, this seems like a good downside to introduce.
Holistic Wisdom to Trail of Evidence - Holistic Wisdom ended up being fairly oppresive, as it would endlessly rebuy the same counterspells and draw spells. Trail of Evidence is at a similar power level, but at least doesn't lead to repetitive gameplay.
I also looked at Archangel Avacyn, as it's a very strong flash creature. However, I don't really want to deal with random people at a store pulling the card in and out of the sleeve when it transforms. Also, given the current price of Avacyn, I'm doubly not interested.
Rattlechains was also a consideration, but with only 4 other spirits in the stack, it doesn't really do enough; both as a creature and as an ability.
In my stack I only allow a single spell per turn without any special errata, so yes, the Rebound effect would count as your spell for the turn. In fact, this is why I don't have any Rebound effects in my stack - what seems like a great play the first turn can cost you the game when you're forced to cast the same spell on the next turn.
However, Type 4 doesn't have any formal rules committe or anything, so you're free to use any erratas you feel make it the most fun/balanced for your environment. I know there are plenty of Type 4 stacks out there that have all sorts of errata to get around the one spell per turn rule.
Just adding some updates from the cards that have been released over the past year. Basically looked for cards that were underperforming or not doing fun things and tried to replace them with better/more fun cards.
Erebos, God of the Dead to Void Winnower - Erebos never really did much, and getting enough devotion was unrealistic. Void Winnower continues the "opponents can't" theme.
Lord of the Void to Stormbreath Dragon - Stormbreath finally dropped to a reasonable price, so it was an easy addition. Punishes those who draw too much too.
Deadeye Navigator to Savage Knuckleblade - Deadeye was either broken or did nearly nothing, usually the latter. Knuckleblade is a reasonable beater that can protect itself.
Dregs of Sorrow to The Great Aurora - Dregs always had trouble targeting things and was often countered when it would have done something. The Great Aurora should at least do something interesting until I get sick of it and find a replacement.
Artifacts
Akroma's Memorial to Blade of Selves - With all the EtB effects, Blade should do some work. Not entirely sure on this one, but Akroma's Memorial's biggest selling point is the haste, which doesn't do much as a sorcery speed card.
Most of your assessments seem spot on as usual. I think Blighted Cataract seems great - uncounterable draw + lets you actually draw into answers and cast them. I also don't mind Blighted Fen, as at least in my cube, most people only have out 1 or 2 guys at most.
Tolarian Academy - it's the best card type, and it synergizes with the second best type to consistently produce more mana than any other land - in the best color to boot. Only downside is that it's banned/restricted everywhere, so I hardly get to play with it :-(
Swaps
Flash Creatures
Creatures (and Effective Creatures)
Instants
Sorceries
Lands
I agree that Kaladesh isn't very promising for Type 4. Personally, I'm only looking at Noxious Gearhulk myself (@104 spoils), since I don't have tokens in my stack.
Flash Creatures
Creatures (and Effective Creatures)
Instants
Sorceries
Artifacts
Enchantments
As for Ethereal Ambush, it's been pretty fun in my stack. It rarely hits 2 creatures, but sometimes when it does it's crazy. It compares favorably to the bottom 50% of flash creatures. It also has a really fun gameplay aspect that most other flash creatures lack.
For Conspiracy 2 spoilers, I'm excited to try out Expropriate, though it might be too powerful in my stack. Capital Punishment also seems like a strong wrath variant and I'm glad that Stunt Double is finally a card. And hopefully I can get 1 or 2 "you become the monarch" cards in my stack, as it sounds like an interesting mechanic for multiplayer.
Also a few more spoils now that should be auto includes, like Summary Dismissal, Fortune's Favor, Spell Queller, and Lashweed Lurker. Elder Deep-Fiend is also borderline playable, but probably just worse than Havenwood Wurm (which I don't even have in my stack).
-100 Frantic Search
-100 Hermit Druid
-100 Mind's Desire
-100 Necropotence
-100 Vampiric Tutor
Won't:
705 Scalding Tarn
662 Abrupt Decay
443 Thoughtseize
323 Snapcaster Mage
256 Rishadan Port
I'd probably look to add some utility lands, as they're a great way to add more actions in a turn. Also, I'm surprised you don't have either Leyline of Anticipation or Vedalken Orrery, as they really make things more interesting. If those cost too much, Alchemist's Refuge will at least let you pull some shenanigans once per cycle.
Finally, I've decided to include some Clue token cards in this update, even though I generally don't use tokens, since clues will usually just be cached in for cards immediately.
Swaps
Creatures
Instants
Sorceries
Artifacts
Enchantments
I also looked at Archangel Avacyn, as it's a very strong flash creature. However, I don't really want to deal with random people at a store pulling the card in and out of the sleeve when it transforms. Also, given the current price of Avacyn, I'm doubly not interested.
Rattlechains was also a consideration, but with only 4 other spirits in the stack, it doesn't really do enough; both as a creature and as an ability.
However, Type 4 doesn't have any formal rules committe or anything, so you're free to use any erratas you feel make it the most fun/balanced for your environment. I know there are plenty of Type 4 stacks out there that have all sorts of errata to get around the one spell per turn rule.
Will:
-100 Frantic Search
-100 Mind's Desire
-100 Necropotence
-100 Tinker
-100 Vampiric Tutor
Won't:
1630 Brainstorm
705 Scalding Tarn
443 Thoughtseize
323 Snapcaster Mage
256 Rishadan Port
Creatures
Flash Creatures
Instants
Sorceries
Artifacts
Enchantments
Ugin's Insight looks like it will be interesting too. It's conditional, but the fail case is fine. Bane of Bala Ged seems like a better Ulamog's Crusher.
Other than that, all the other stuff I'm interested wouldn't work in your high-power stack.