Atarka, World Render seems like she would make a pretty cheesy voltron commander.
Mainly because you're in colors that can ramp and tutor up creatures (Atarka can instant-kill a player if she connects when boosted by Xenagos, God of Revels, and that card is fairly resilient itself), and also have access to green cards that block enemies from playing on your turn.
Exile Silverbark Guardian: Until end of turn, whenever a nontoken creature dies, put a token that's a copy of that creature onto the battlefield tapped under its owner's control.
I'm assuming they're intended to be token copies of the dying creatures.
I'm pretty sure that effect's also too strong for an uncommon card.
What if you used the transform mechanic to simulate two cards combining into one more powerful one?
It would need a new keyword, I think, but here's what I thought of:
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Onmyo Turtle - 2:symug::symug: Legendary Creature - Turtle
Defender, hexproof 3:symug::symug:: If you control both Onmyo Turtle and Onmyo Snake, transform both of them. (They're treated as a single card while transformed.) 3/5
Onmyo Snake - 1:symug::symug: Legendary Creature - Snake
Whenever Onmyo Snake deals combat damage to a creature, tap that creature. It doesn't untap during its controller's next untap step. UG: Target creature gets -2/-0 until end of turn and blocks Onmyo Snake this turn if able. Play this ability only once each turn. 1/2
Genbu of the North Legendary Creature - Turtle Snake Spirit
Vigilance, hexproof
Whenever Genbu of the North becomes blocked by a creature, Genbu of the North gains deathtouch until end of turn.
Whenever Genbu of the North deals combat damage to a player, tap all permanents that player controls and untap all permanents you control. 6/6
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Ignoring how strong/weak/whatever it is, since that was just to outline the concept.
Basically, two separate cards that are at least usable on their own, but that CAN merge into one more powerful form if you have them both available.
Someone showed me the spoilers with the Bruna/Gisela hybrid Eldrazi Angel card, and I remembered this post of mine from a long time ago.
Soulkeeper Watcher3W
Creature - Spirit (R)
Flying
Whenever another nontoken creature you control dies, put a charge counter on Soulkeeper Watcher.
At the beginning of your upkeep, remove a charge counter from Soulkeeper Watcher. If you do, put a 1/1 white Spirit creature token with flying onto the battlefield.
Sacrifice X Spirits: Return target creature card with converted mana cost X from your graveyard onto the battlefield.
2/3
I feel like this needs "X can't be 0" or a similar sort of restriction on it, since as it stands you can just keep sacrificing zero Spirits to reanimate an Ornithopter ad infinitium. Seems like too simple a way to get infinite ETB/sacrifice/dies triggers.
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Failure's Tutelage - 2UB Sorcery (R)
Exile three nonland cards from your graveyard that share a name. If you do, you may search your hand, library, or graveyard for a card with the same name as the exiled cards and cast it without paying its mana cost. If you searched your library this way, shuffle it.
Exile Failure's Tutelage. "If at first you don't succeed..."
On a more serious note, you seem to be playing around in Ulamog's (exile and process) and Kozilek's (colorless mana in costs) spaces. Nothing original for Emrakul?
Well, Emrakul isn't around to influence her brood on Zendikar, so you can just say they borrowed some tricks from the other broods. It also does have a play on Emrakul's protection(s).
Mostly it's because Emrakul's brood doesn't have any identity at the moment. Vestige of Emrakul isn't really anything noteworthy.
Revenant of Emrakul - 1CC Creature - Eldrazi (M)
You may cast Revenant of Emrakul from your graveyard or exile by putting two cards your opponents own from exile into their owners' graveyards in addition to paying its mana cost.
Revenant of Emrakul has protection from sources that share a name with an exiled card owned by that source's controller. (This creature can't be blocked, targeted, dealt damage, or enchanted by anything that shares a name with an exiled card owned by that source's controller.)
As if to compensate for their reduced numbers, the remains of Emrakul's brood had become that much more resilient. Which raised the fear of just how resilient Emrakul herself would be...
3/1
Primordial Ripple: So, for 4UUGGG, I get a creature from my library and a copy of any creature on the board. I think this needs to stand out from Tooth and Nail a bit more, maybe, which gives you any two creatures from your hand and/or library for 7GG.
The token-making half of the card is also pretty overcosted. You could easily get away with making two, or possibly three, copies of the creature for that cost, since five copies of a creature costs 7UU.
Plus, if you do three tokens, we get another card that enables Biovisionary in its own colors.
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Anyway, Eldrazi cards seem to be the thing lately.
Broodnest Legendary Land (R)
You may play Broodnest from your graveyard as long as you control an Eldrazi with converted mana cost 6 or more. T: Add C to your mana pool.
When Broodnest is put into a graveyard from the battlefield, put a 1/1 colorless Eldrazi Scion creature token onto the battlefield. It has "Sacrifice this creature: Add C to your mana pool."
Decay: It seems fair and on-color. Could possibly be uncommon, being instant-speed LD, but that would depend on limited format, I guess.
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Gift of the Rotwood - (B/G)(B/G) Instant (U)
If B was spent to cast Gift of the Rotwood, target creature gets -1/-1 until end of turn for each B spent.
If G was spent to cast Gift of the Rotwood, target creature gets +2/+2 until end of turn for each G spent. "In hands blessed by the Rotwood, or in bodies cursed, the splinters of fetid lumber can pierce even the strongest of defenses."
I feel like it also equipping the equipment is a bit much.
That said, if this is a thread for cards in the feel of pre-Battle Zendikar:
Avalanche Elemental - 2RG Creature - Elemental (R)
Trample, haste
Whenever Avalanche Elemental attacks, it gets +X/+0 until end of turn, where X is the number of lands you control.
At the beginning of the end step, sacrifice Avalanche Elemental. Where natural order meets natural disaster.
2/1
Scute Swarm - 1GG Creature - Insect (M) Landfall - Whenever a land enters the battlefield under your control, put a token onto the battlefield that's a copy of Scute Swarm. "Survival rule 782: There are ALWAYS more scute bugs." - Zurdi, goblin shortcutter
1/1
*Edit: Added 1 to Scute's mana cost. It's probably still a bit strong, though.
Drifting Deadsands Land T: Add C to your mana pool. 1C, T, Exile Drifting Deadsands: Until end of turn, if a land is tapped for mana, it produces C instead of any other type and amount.
One-shot colorless Contamination effect, with a C activation cost so it's not TOO easy to splash. Not sure if it's too cheap to activate even with the requirement.
I don't have any concepts for an actual card, but regarding the actual mechanic.
I feel like it should say "if/as long as a player's life total is half their starting life or less". It being a whole keyword and not just a one-off effect, it seems like you'd want to make it more 'stable' for other formats besides traditional 1v1.
Mainly because you're in colors that can ramp and tutor up creatures (Atarka can instant-kill a player if she connects when boosted by Xenagos, God of Revels, and that card is fairly resilient itself), and also have access to green cards that block enemies from playing on your turn.
I'm assuming they're intended to be token copies of the dying creatures.
I'm pretty sure that effect's also too strong for an uncommon card.
Someone showed me the spoilers with the Bruna/Gisela hybrid Eldrazi Angel card, and I remembered this post of mine from a long time ago.
I feel like this needs "X can't be 0" or a similar sort of restriction on it, since as it stands you can just keep sacrificing zero Spirits to reanimate an Ornithopter ad infinitium. Seems like too simple a way to get infinite ETB/sacrifice/dies triggers.
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Failure's Tutelage - 2UB
Sorcery (R)
Exile three nonland cards from your graveyard that share a name. If you do, you may search your hand, library, or graveyard for a card with the same name as the exiled cards and cast it without paying its mana cost. If you searched your library this way, shuffle it.
Exile Failure's Tutelage.
"If at first you don't succeed..."
I couldn't think of a good name for this.
Well, Emrakul isn't around to influence her brood on Zendikar, so you can just say they borrowed some tricks from the other broods. It also does have a play on Emrakul's protection(s).
Mostly it's because Emrakul's brood doesn't have any identity at the moment. Vestige of Emrakul isn't really anything noteworthy.
Creature - Eldrazi (M)
You may cast Revenant of Emrakul from your graveyard or exile by putting two cards your opponents own from exile into their owners' graveyards in addition to paying its mana cost.
Revenant of Emrakul has protection from sources that share a name with an exiled card owned by that source's controller. (This creature can't be blocked, targeted, dealt damage, or enchanted by anything that shares a name with an exiled card owned by that source's controller.)
As if to compensate for their reduced numbers, the remains of Emrakul's brood had become that much more resilient. Which raised the fear of just how resilient Emrakul herself would be...
3/1
Loosely based on True-Name Nemesis.
The token-making half of the card is also pretty overcosted. You could easily get away with making two, or possibly three, copies of the creature for that cost, since five copies of a creature costs 7UU.
Plus, if you do three tokens, we get another card that enables Biovisionary in its own colors.
---
Anyway, Eldrazi cards seem to be the thing lately.
Broodnest
Legendary Land (R)
You may play Broodnest from your graveyard as long as you control an Eldrazi with converted mana cost 6 or more.
T: Add C to your mana pool.
When Broodnest is put into a graveyard from the battlefield, put a 1/1 colorless Eldrazi Scion creature token onto the battlefield. It has "Sacrifice this creature: Add C to your mana pool."
It's loosely inspired by Flagstones of Trokair, but with Eldrazi flavor.
Goblin Bombardment, among other things. I just wanted to point that out because it's kinda blatant.
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Gift of the Rotwood - (B/G)(B/G)
Instant (U)
If B was spent to cast Gift of the Rotwood, target creature gets -1/-1 until end of turn for each B spent.
If G was spent to cast Gift of the Rotwood, target creature gets +2/+2 until end of turn for each G spent.
"In hands blessed by the Rotwood, or in bodies cursed, the splinters of fetid lumber can pierce even the strongest of defenses."
That said, if this is a thread for cards in the feel of pre-Battle Zendikar:
Avalanche Elemental - 2RG
Creature - Elemental (R)
Trample, haste
Whenever Avalanche Elemental attacks, it gets +X/+0 until end of turn, where X is the number of lands you control.
At the beginning of the end step, sacrifice Avalanche Elemental.
Where natural order meets natural disaster.
2/1
Scute Swarm - 1GG
Creature - Insect (M)
Landfall - Whenever a land enters the battlefield under your control, put a token onto the battlefield that's a copy of Scute Swarm.
"Survival rule 782: There are ALWAYS more scute bugs." - Zurdi, goblin shortcutter
1/1
*Edit: Added 1 to Scute's mana cost. It's probably still a bit strong, though.
Land
T: Add C to your mana pool.
1C, T, Exile Drifting Deadsands: Until end of turn, if a land is tapped for mana, it produces C instead of any other type and amount.
One-shot colorless Contamination effect, with a C activation cost so it's not TOO easy to splash. Not sure if it's too cheap to activate even with the requirement.
And a different name because Unstable Frontier.
I feel like it should say "if/as long as a player's life total is half their starting life or less". It being a whole keyword and not just a one-off effect, it seems like you'd want to make it more 'stable' for other formats besides traditional 1v1.
Not really weak or anything, just underwhelming.
So yeah, it's pretty much Ayli.