MTG Salvation

Foreign Plague 3BB
Sorcery
Emerge 2UB
All creatures get -1/-1 for each color used to cast Foreign Plague they do not share. When Foreign Plague is cast for its Emerge cost, each creature gets -1/-1 for each creature type the sacrificed creature has that they do not share.

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Instant board wipe when sacrificing a Changeling. Emerge, as a cost reduction, does NOT count the colors of the sacrificed creature for its base effect.

I'll reword the keywords for clarity of what I think they do, and to add a touch more user-friendliness and design space:

Overdraw (You may have this spell cost less to cast and add X overdraw counters to it. At the beginning of each of your upkeeps, remove an overdraw counter and pay or lose the game)
-the adjustment makes it so that if you have Platinum Angel, you can't just ignore it, as the counters stay put. The counters themselves also make tracking it easier, while making it subject to penalizing via Proliferate and boosting via counter-removal. However, it also means that the card has to stay "in play" in some way (Suspend might work), so it excludes previously-usable Instants and Sorceries. Also, by having it be counters, you can actually have the Overdraw give diminishing penalties/benefits for using it. This does mean your opponent may enter a catch 22 where they need to destroy/counter a permanent, but if they don't, you lose to Overdraw, and you can get out of the penalty by destroying the permanent yourself.
Fury <cost> (Whenever this creature dies, you may pay <cost>. If you do, this creature deals X damage {X is base power} to target creature or player
-the adjustment is because specifying damage to Planeswalkers is really, really rare (I actually think it doesn't exist yet...) and quite narrow in use. Damage to players always can be shifted to Planeswalkers and damage to Planeswalkers is, generally, more useful than to players early on. As it's already base power, there's little issue to be had because you can't boost the damage.
Scale X (whenever this would deal more than X damage, reduce the damage dealt to X)
-the adjustment should be purely rewording to fit the way Magic works better and clarifying what it actually does.

So, have a card for each:

Consulate Riot Carriage
Artifact - Vehicle
Overdraw (You may have this spell cost less to cast and add 3 overdraw counters to it. At the beginning of each of your upkeeps, remove an overdraw counter and pay or lose the game)
Consulate Riot Carriage and creatures currently tapped to crew it have Shroud.
Crew 3 (Tap any number of creatures you control with total power 3 or more: This Vehicle becomes an artifact creature until end of turn.)
3/5

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The point of this is to be able to "cheat out" a reusable Shroud provider for anti-removal purposes early on, or wait a lengthy time to do so. As the creature has to Crew to get Shroud, it interferes with tap abilities and combat tricks. The primary purpose is, ultimately, to have a reusable, ultra-efficient targetting denial. Of course, then they can break out the untargetted damage to nuke the Carriage itself. Being Shroud, you can't target the creatures yourself, and the line for giving Shroud to crewing creatures removes it when they untap for any reason.

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Vindictive Goblin 1R
Creature - Goblin
Fury (Whenever this creature dies, you may pay . If you do, this creature deals 2 damage to target creature or player
2/1

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I was tempted to add a second ability, like having it get Double Strike or a Power bonus when blocked by a creature that deals First Strike damage, but the idea of retaliatory damage (vindication) is what Fury's there for.

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Prizewinning Experiment GU
Creature - Drake Mutant
Evolve, Scale 4 (whenever this creature would deal more than 4 damage, reduce the damage dealt to 4)
As long as Prizewinning Experiment has a +1/+1 counter on it, it has Flight and Shroud
3/2
While it handily won the long-standing prize for a griffin-superior krasis, many members of the Simic Combine feel it to be a crude intermediary step due to complex maturation needs and stark limitations with its design

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This card is, mostly, a matter of flavor. It starts with one less toughness than Harrier Griffin, which has the highest raw stats of any griffin in the Ravnica blocks, but requires a +1/+1 counter for Flight and then gets the double-edged sword of Shroud. Which makes it have an unarguably better body than any griffin in Ravnica. Assault Griffin's flavor text reads that there's a prize for any Biomancer who makes a Krasis better at aerial combat than a griffin. So while it trivially surpasses a Griffon, it's pretty starkly limited in damage output, and because of that limit to 4 damage at a time and becoming untargettable once it gets its first +1/+1 counter, it gets a premium statline. Even before Shroud activates, you still can't get it to deal more than 4 damage at a time with Equipment or Auras.

Yamazaki-clan Retainer 1(R/W)
Creature - Human Samurai
Bushido 1, Bands with other Samurai
If Yamazaki-clan Retainer is in a Band, it gains Haste.
1/2

It has returned. Pick one or more things from it.

...Can you give a list of examples? Because I'm pretty sure there isn't a compiled list, and I don't think that it's at all easy to locate all of it. Particularly because I have no idea what is or isn't Evergreen at this point.

...Friendly-restricted Morbid?

Survivor of Bala Ged 1WR
Creature - Human Ally
Avenge - If a creature you control died this turn, Ally creatures you control have First Strike
3/2

Landbreaker of Emrakul
Creature - Eldrazi
Annihilator 2
Blight - When a land is put into a graveyard from the battlefield, put a 0/1 colorless Eldrazi Spawn creature token onto the battlefield. It has "Sacrifice this creature: Add to your mana pool"
5/8

The LIST! maker revives! And Amuzet, you don't change the mechanic. Use it as written.

Pick one from the list in the spoiler. The blue square with "LIST! (click to show)".

Infested Sliver 2BG
Creature - Sliver Fungus
All Slivers you control have "At the beginning of your upkeep, this creature deals 1 damage to you" and "Whenever this creature is dealt damage, put a +1/+1 counter on it."
Override (When Infested Sliver enters the battlefield, you may have an opponent take control of it. When you take control of this, sacrifice another permanent that shares a type with it)
2/2

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Basically just a nerfed Fungus Sliver. With the keyword given being used for Plague Sliver purposes.

Pretty sure Alliance was used for a different mechanic at some point... I'll just slap it on a Sliver.

Trader Sliver 2WU
Creature - Sliver
Alliance
Slivers you control have Alliance
2/2
It brings supplies gathered by trading what the Hive finds and lacks uses for and trades for supplies the Hive desires

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Slivers do a lot of digging. Chances are, they find a lot of ores. Bringing valuable ores, such as gold and iron, to places that can refine them into the valuable metals can allow the Slivers to get food and useful construction material without much chance of loosing a lot from combat. Almost certainly impossible in-universe, but it makes logical sense as a thing for a semi-sapient communal organism to give a try.

LIST! still hasn't had anything added, as I'm wanting to have it shrink down.

Once more, reminding people the thread exists. Just pick one mechanic from the LIST! and make a card for it.

Reminding people the thread exists, and pointing out that the LIST! has been moved to a spoiler. Let's get the thread moving again, people. Just pick a mechanic in the LIST! and make a card for it. That mechanic will be absent for the next version of the LIST!, to be done with my next actual reply.

Boneyard Mass 2BU
Creature - Skeleton Cleric
Sacrifice X Humans or Angels: Monstrosity X
Gravemorph: Sacrifice an Angel
If Boneyard Mass is sent to the graveyard while Monstrous and its Gravemorph cost was not paid, put X 1/1 Blue Spirits with Flying into play, where X is the number of +1/+1 counters on Boneyard Mass.
3/3

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The LIST! is once more brought up, this time in a spoiler:

Is Creep just an adjustment of Swoop? Because I like. It has fun interactions.

Stalking Spider 1BG
Creature - Spider
Reach, Deathtouch
Creep 1 (When this creature blocks or becomes blocked by a non-flying creature, it deals 1 damage to that creature.)
0/1

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The result here is effectively that creatures without Flying that block or are blocked by it are instantly killed before First Strike triggers.

The LIST! has nothing new this time:

Chainbreaking X {cost} (This creature comes into play with X -1/-1 counters on it. You may pay {cost} to remove a -1/–1 counter from it)

Spellblock X (whenever a sorcery, instant or ability would target this creature, counter it if its CMC is X or less)

Intercept {cost} (You may cast this creature for it's Intercept cost during an opponent's combat step, before blockers are declared. If you do, put it into play blocking target creature and return it to its owner's hand at the end of the combat step)

Swoop X (When this creature blocks a creature without Flying, it gains +x/+x until end of turn)

Arcana (When this Aura comes into play, you may have it come into play enchanting a 0/0 Spirit creature token)

Bloodlust X (Whenever this creature destroys a creature by combat, put X +1/+1 counters on it)

Infuse {mana} (You may cast this spell for it's Infuse cost. If you do, it is an Enchantment - Aura with Enchant creature)

Upgrade {cost} (If this Artifact is cast for it's Upgrade cost, it comes into play as an Equipment attached to target Artifact Creature. If the equipped creature leaves play, this Artifact goes to the same zone.)

Wiseblow X (whenever this creature attacks or blocks, if you have more than four cards in hand, this creature gets +X/+X until end of turn)

Obliterate (whenever a creature would be dealt damage by {this}, exile that creature instead)

Improve - Whenever {ability} {activates/triggers}, {effect}

Empower X/Y {cost} (Pay {cost}: {cardname} gets X/Y until end of turn)

Lifesteal X (whenever this creature/spell deals damage, you gain X life)

Grow X {cost} (Pay {cost}: Put X +1/+1 counters on {cardname})

Obscuring Sliver 1UG
Creature - Sliver
Morph
Slivers in your hand have Morph X, where X is their mana cost reduced by
Colorless 2/2 creatures you control count as Slivers in addition to their other types.
1/1

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The LIST! has returned, with the full sum of the keywords I have put in it that I can find:

Chainbreaking X {cost} (This creature comes into play with X -1/-1 counters on it. You may pay {cost} to remove a -1/–1 counter from it)

Formation X (whenever this creature attacks or blocks, it gets +X/+X until end of turn if another allied creature with Formation is attacking or blocking)

Spellblock X (whenever a sorcery, instant or ability would target this creature, counter it if its CMC is X or less)

Intercept {cost} (You may cast this creature for it's Intercept cost during an opponent's combat step, before blockers are declared. If you do, put it into play blocking target creature and return it to its owner's hand at the end of the combat step)

Incarnate {cost} (When you cast this spell, you may cast it for it's Incarnate cost. If you do, it comes into play as an X/X Spirit creature, where X is this spell's CMC)

Swoop X (When this creature blocks a creature without Flying, it gains +x/+x until end of turn)

Arcana (When this Aura comes into play, you may have it come into play enchanting a 0/0 Spirit creature token)

Bloodlust X (Whenever this creature destroys a creature by combat, put X +1/+1 counters on it)

Infuse {mana} (You may cast this spell for it's Infuse cost. If you do, it is an Enchantment - Aura with Enchant creature)

Upgrade {cost} (If this Artifact is cast for it's Upgrade cost, it comes into play as an Equipment attached to target Artifact Creature. If the equipped creature leaves play, this Artifact goes to the same zone.)

Wiseblow X (whenever this creature attacks or blocks, if you have more than four cards in hand, this creature gets +X/+X until end of turn)

Obliterate (whenever a creature would be dealt damage by {this}, exile that creature instead)

Improve - Whenever {ability} {activates/triggers}, {effect}

Empower X/Y {cost} (Pay {cost}: {cardname} gets X/Y until end of turn)

Lifesteal X (whenever this creature/spell deals damage, you gain X life)

Grow X {cost} (Pay {cost}: Put X +1/+1 counters on {cardname})

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For those unfamiliar with my LIST!, pick one or more of the keywords on it for your card or cards, and I'll remove that keyword from the LIST! for at least two or three posts.

Edit: The LIST! is reposted with each post I make, by the way. So expect a lot of space-devouring posts in the near future.

What's Gravestorm do?