I feel that the people that are arguing in favor of no banned list are likely the ones that disagree with why the cards they want to play with are banned to begin with.
As far as envisioning people showing up with decks and then discussing how to proceed before hand.... I really don't see that ever working and perhaps that's just my skepticism but everyone often has different thoughts about power level and not everyone is going to be reasonable about that. That sort of discussion definitely does take longer than a minute and for people that aren't regulars to the playgroup (Like coming into an LGS or even new blood) they're just going to look to play and this would deter them.
It is simpler and easier for stability and enjoyment of the game to have a singular ban list and if you want to make adjustments to that in your playgroup (via unban or ban) then that's certainly your choice.
I don't think that everyone is going to be 100% happy with what is/isn't on the banned list. (I personally think cards like Food Chain and Tooth and Nail are much too good.) That being said please refer to my above statement regarding house bans and unbans.
Just to clarify for the subchallenge of snow or colorless mana cost do you mean converted mana cost or in rules text such as activated abilities, alternate costs, etc.? (I don't think I've ever seen a card with snow in it's CMC or along side colored mana symbols)
Monarch of the Wilds2SSGG
Legendary Snow Creature - Bear
Trample, hexproof
Hibernate 3—SG Rather than cast this card from your hand you may pay SG and put it onto the battlefield tapped with 3 ice counters on it. At the beginning of your end step, remove an ice counter from it.
Creatures with ice counters on them don't untap.
Other bear creatures you control get +1/+1 and have trample. 6/4
Altar of the Pilgrims4
Artifact
Whenever a non-token creature you control dies you may pay W. If you do, gain 2 life.
Whenever a non-token creature you control dies you may pay B. If you do, create a 1/1 colorless Eldrazi Scion creature token. It has "Sacrifice this creature: Add C to your mana pool."
I was thinking about going low to the ground and trying to get advantage from that. Cards like Silver-Inlaid Dagger give our Pirate Captain a nice buff for super cheap. While the monkey is cool I wasn't really able to find anything that can use him well outside of Helm of Possession or Goblin Bombardment.
Kill conditions are very relevant in this kind of deck and nothing jumps out better than Marionette Master.
Regarding the cards that you mentioned: Fatal Push: I couldn't agree more. Disallow: Most of the time this is going to end up being no better than Cancel and potentially worse than Void Shatter. So I'd likely relegate it to the sideboard or even swap it out for something along the lines of Summary Dismissal which can be great versus Emrakul, the Promised End or even Ulamog, the Ceaseless Hunger. Reverse Engineer: While a draw 3 for potentially UU is great, I feel that Painful Truths is still a better choice as it comes down earlier and makes use of the mana from Tezzeret. Trophy Mage: While something to consider when we have the full set in front of us, there really isn't much that this can fetch right now that feels relevant/impactful short of a mana rock or a Pilgrim's Eye. Pacification Array: This definitely seems like something useful as a one of in grindy control matchups. Industrial Tower: While nice for mana fixing I feel that there are other lands that can do the splash better as we can avoid paying life if necessary or if we are unfortunate enough to not have an artifact out. Yahenni's Expertise: I completely agree. Baral's Expertise: While a huge tempo swing I do agree that it's too strong even though living the dream of bouncing your own stuff, playing the 4 mana expertise and effectively cascading into a 3 drop would be cool. Whir of Invention: Short of a toolbox deck I don't really see this being relevant. Baral, Chief of Compliance: I see no reason not to run him main-deck if we have enough spells or counters to make him useful.
Other than Secret Salvage you don't really seem to have ways to exile it or ways to get rid of copies in your hand already. Draw and discard effects might be useful such as Catalog and an alternate method to exile them would be Lost Legacy or even Transgress the Mind
Had a similar thought for other cards that would be awesome in the set. Hopefully that comes to pass. (Was thinking of cards such as Judge UnworthyHalt Order and Thopter Assembly.
Carnival Jester1RR
Creature - Goblin Clown (U)
Menace
Whenever Carnival Jester attacks you may discard a card. If you do, Carnival Jester gets +2/+0 until end of turn. The phrase 'Knock 'em dead!' means something very different to the Rakdos. 3/2
Mirrorworks really isn't the way that I'm aiming to go with this list but I do appreciate the feedback regarding Nihil Spellbomb and the artifact lands. Vandalblast is a bit of a concern of course as the incidental stone rain can't be offset by Silas (Since they're not spells) but I'll give them a shot anyway.
Jodah, Archmage Eternal4WWUU
Legendary Creature - Human Wizard
Vigilance
At the beginning of your upkeep, scry 1 UU,t: Search your library for a card, exile it, then shuffle your library.
Target opponent may have you put that card into your hand. If they don't, you draw two cards. 5/7
Spellgaunt2WBG
Creature - Insect Horror
Protection from Instants
When Spellgaunt enters the battlefield, destroy all enchantments.
When an enchantment is put into the graveyard from the battlefield it's controller loses life equal to it's mana cost. 6/4
As far as envisioning people showing up with decks and then discussing how to proceed before hand.... I really don't see that ever working and perhaps that's just my skepticism but everyone often has different thoughts about power level and not everyone is going to be reasonable about that. That sort of discussion definitely does take longer than a minute and for people that aren't regulars to the playgroup (Like coming into an LGS or even new blood) they're just going to look to play and this would deter them.
It is simpler and easier for stability and enjoyment of the game to have a singular ban list and if you want to make adjustments to that in your playgroup (via unban or ban) then that's certainly your choice.
I don't think that everyone is going to be 100% happy with what is/isn't on the banned list. (I personally think cards like Food Chain and Tooth and Nail are much too good.) That being said please refer to my above statement regarding house bans and unbans.
Legendary Snow Creature - Bear
Trample, hexproof
Hibernate 3—SG Rather than cast this card from your hand you may pay SG and put it onto the battlefield tapped with 3 ice counters on it. At the beginning of your end step, remove an ice counter from it.
Creatures with ice counters on them don't untap.
Other bear creatures you control get +1/+1 and have trample.
6/4
Artifact
Whenever a non-token creature you control dies you may pay W. If you do, gain 2 life.
Whenever a non-token creature you control dies you may pay B. If you do, create a 1/1 colorless Eldrazi Scion creature token. It has "Sacrifice this creature: Add C to your mana pool."
Next: Kagemaro, First to Suffer
Kill conditions are very relevant in this kind of deck and nothing jumps out better than Marionette Master.
Regarding the cards that you mentioned:
Fatal Push: I couldn't agree more.
Disallow: Most of the time this is going to end up being no better than Cancel and potentially worse than Void Shatter. So I'd likely relegate it to the sideboard or even swap it out for something along the lines of Summary Dismissal which can be great versus Emrakul, the Promised End or even Ulamog, the Ceaseless Hunger.
Reverse Engineer: While a draw 3 for potentially UU is great, I feel that Painful Truths is still a better choice as it comes down earlier and makes use of the mana from Tezzeret.
Trophy Mage: While something to consider when we have the full set in front of us, there really isn't much that this can fetch right now that feels relevant/impactful short of a mana rock or a Pilgrim's Eye.
Pacification Array: This definitely seems like something useful as a one of in grindy control matchups.
Industrial Tower: While nice for mana fixing I feel that there are other lands that can do the splash better as we can avoid paying life if necessary or if we are unfortunate enough to not have an artifact out.
Yahenni's Expertise: I completely agree.
Baral's Expertise: While a huge tempo swing I do agree that it's too strong even though living the dream of bouncing your own stuff, playing the 4 mana expertise and effectively cascading into a 3 drop would be cool.
Whir of Invention: Short of a toolbox deck I don't really see this being relevant.
Baral, Chief of Compliance: I see no reason not to run him main-deck if we have enough spells or counters to make him useful.
Planeswalker - Luar
+2: Creatures your opponents control get -2/-0 until your next turn. You discard a card.
-4: Discard a card then draw cards equal to the discarded card's converted mana cost.
-12: You get an emblem with "Whenever an opponent discards a card you may instead cast it without paying its mana cost."
4
Next: An evil twin of an existing planeswalker.
Artifact Creature - Construct
Cannot be blocked by creatures with converted mana cost 3 or greater.
When ~ deals combat damage to a player you may draw a card.
1/1
Piston Sledge also seems really good with Marionette Master.
Creature - Goblin Clown (U)
Menace
Whenever Carnival Jester attacks you may discard a card. If you do, Carnival Jester gets +2/+0 until end of turn.
The phrase 'Knock 'em dead!' means something very different to the Rakdos.
3/2
Legendary Creature - Human Wizard
Vigilance
At the beginning of your upkeep, scry 1
UU,t: Search your library for a card, exile it, then shuffle your library.
Target opponent may have you put that card into your hand. If they don't, you draw two cards.
5/7
Next - A Commander who hates planeswalkers.
Creature - Insect Horror
Protection from Instants
When Spellgaunt enters the battlefield, destroy all enchantments.
When an enchantment is put into the graveyard from the battlefield it's controller loses life equal to it's mana cost.
6/4