msem-instigator

Flying
{U}: Put Cloud Sovereign on top of its owner's library.
Foresee — As you draw Cloud Sovereign, you may reveal it and pay {1}{W}. When you do, create a 1/1 white Bird creature token with flying.

Stampede — Whenever Cloud's Roar Avenger and a creature with greater power attack, tap up to one target creature.

Flying
When Cloudchaser Kestrel enters the battlefield, destroy target enchantment.
{W}: Target permanent becomes white until end of turn.

Flying
When Cloudheath Sentinel enters the battlefield, return target artifact card with mana value 2 or less from your graveyard to the battlefield.

Flying, lifelink
When Cloudshaper Pilgrim enters the battlefield, return target creature or enchantment card with mana value 3 or less from your graveyard to your hand.

When Coalition Apothecary enters, you gain 1 life for each nonland permanent you control.

Flash
When Cocky Bladesinger enters the battlefield, it gains first strike, lifelink, and haste until end of turn.

Target creature you control gains hexproof and indestructible until end of turn. If it's a Knight or Soldier, put a +1/+1 counter on it.

When Coercive Cardinal enters the battlefield, choose an opponent. That player may have you gain 5 life. If the player doesn't, create two 1/1 white Cleric creature tokens.

When Cognitive Fumigator enters the battlefield, target opponent reveals their hand. You may choose a nonland card from it and exile that card. If you do, that player draws a card.
Recite {2}{U} (You may cast this creature from your graveyard for its recite cost. If you do, exile it when it enters the battlefield or if it would leave the battlefield.)

Concord — When Coiling Spiritscale enters the battlefield, return target permanent card from your graveyard to your hand. If there are four or more card types among permanents you control, you may return that card to the battlefield instead.

Equipped creature gets +1/+1 and has vigilance.
Equip {1}

Flash
When Collapsed Mine enters the battlefield, exile another target nonland permanent until Collapsed Mine leaves the battlefield.

Haste
When Collapsing Star Viper enters the battlefield, you may tap target permanent with mana value X or less.
At the beginning of your upkeep, return Collapsing Star Viper to its owner's hand.

First strike

Create a 1/1 colorless Construct Actor creature token for each creature you control.
Compose (Then if you cast this from your hand, exile it and create a Saga token with “III—You may cast a copy of this card from exile without paying its mana cost.”)

Choose one —
• Create two 1/1 white Soldier creature tokens.
• If you spent three or more mana to cast this spell, create five 1/1 white Soldier creature tokens.

Flash
When Colpah Charmer enters the battlefield, you may tap or untap target creature.

Enchant creature
You may cast this spell from your graveyard if it targets a legendary creature you control.
Enchanted creature gets +2/+2 and has vigilance.

Whenever Combat Technician attacks, create a 1/1 colorless Servo artifact creature token that's tapped and attacking. Then Combat Technician gets +1/+1 until end of turn for each artifact you control.

Choose target creature you control, then choose two —
• Put a +1/+1 counter on it.
• Put a lifelink counter on it.
• That creature gains indestructible until end of turn.

At the beginning of your upkeep, exile the top card of your library. You may play it this turn if it has mana value 2 or less.
[+1]: Create a 1/1 colorless Servo artifact creature token. If you exiled an artifact or creature card this turn, create two instead.
[0]: Create a Treasure token. If you exiled a card that had a mana ability this turn, create two instead.
[–1]: Comet deals 2 damage to any target. If you exiled an instant or sorcery card this turn, Comet deals 2 damage to any target.

Whenever a -1/-1 counter is put on a creature you control, you gain 1 life.
{1}{B}, Pay 1 life: Untap target Cleric. You may remove a -1/-1 counter from that creature.

Lifelink
Partner with Imperator Valtasius (When this creature enters the battlefield, target player may put Imperator Valtasius into their hand from their library, then shuffle.)
At the beginning of your upkeep, return target Soldier card from your graveyard to your hand.