msem-instigator

Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)
At the beginning of your end step, if you cast no spells this turn, exile the top card of your library. If it's a nonland card, you may cast it without paying its mana cost.

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)
Whenever Crowd Favorite extorts a spell, put a +1/+1 counter on Crowd Favorite.

Distorted (This creature can be blocked by tapped creatures but not untapped creatures.)
Other creatures you control with distorted get +2/+2.

Whenever Cruising Schooner attacks, it gets +1/+1 until end of turn.
Crew 1 (Tap any number of creatures you control with total power 1 or greater: This Vehicle becomes an artifact creature until end of turn.)

Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)
Crusher Beetle can't be blocked by more than one creature.

{1}{B}, Discard Crusher Claw: Target creature gains winnow until end of turn. (Damage dealt to it also causes its controller to lose that much life.)

When Crystal Vision Abomination enters, create a 1/1 blue Elemental creature token with flying.
Whenever an Elemental you control attacks, that creature gets +1/+0 and first strike until end of turn.

At the beginning of combat on your turn, target embattled creature you control gets +1/+1 and gains vigilance and indestructible until end of turn. (A creature is embattled if it has a counter on it or has a permanent you control attached to it.)

Whenever Culling Claw attacks, target creature gains winnow until end of turn. (Damage dealt to it also causes its controller to lose that much life.)

Flash
When Cunning Mimic enters, sacrifice it unless you return another artifact or creature you control to its owner's hand.

First strike
Aura spells and spells with fabled you cast cost {1} less to cast.
Equip costs you pay cost {1} less.

Flying
Whenever you make first contact, Curio Hellkite deals 2 damage to any target. (You make first contact the first time each turn you cast a spell with a name not in your graveyard or control already.)

Pressure {1}{U} (You may cast this spell for its pressure cost if seven or more cards are in your graveyard.)
When Cuxuri Harbinger enters, draw a card.

Menace
Whenever CySec Blacksuit deals combat damage to a player or planeswalker, create a Function token with “Choose a nonland card exiled by this spell. For as long as that card is exiled, you may cast it and you mana of any type can be spent to cast that spell.” (It's an enchantment. As you cast an instant or sorcery spell, sacrifice any number of Functions to add their effects to that spell.)

Flash
When CySec Disruptor enters, if it was cast, target opponent conjures a card named Data-Point on top of their library. (It's a sorcery that costs {2} with “Draw a card.”)

When CySec Moderation Council enters, choose a nontoken enchantment you control or an enchantment card in your graveyard. Conjure a duplicate of that card into your hand.

Breach (Whenever this deals combat damage to a player, you may have it become an Aura Curse until your next turn. Attach it to that player.)
Whenever a cursed opponent attacks, you may draw a card.

When Cyone, Expedition Captain enters, create a 1/1 Scout creature token that's all colors, then choose flying, first strike, or lifelink. Creature tokens you control gain the chosen ability until end of turn.
Whenever Cyone attacks, aetherize it. (To aetherize, create a token that's a copy of it, then exile that token.)

Vigilance
When Cyrukan Guardians enters, recruit. (Create a 0/0 white Soldier Army creature token, then put a +1/+1 counter on each Army you control.)

Flying
Whenever Cyrukan Weaponmaster attacks, amass Soldiers 1. (Put a +1/+1 counter on an Army you control. It's also a Soldier. If you don't control one, create an 0/0 black Soldier Army creature token first.)

Flying
When Cyrukan's Messenger enters, you may search your library for an Equipment card, reveal it, put it into your hand, then shuffle.
Whenever Cyrukan's Messenger attacks, you may put an Equipment card from your hand onto the battlefield attached to Cyrukan's Messenger.

Flying
Whenever DC-4 Cutie enters or attacks, choose target creature card with mana value 3 or less in your graveyard. You may cast it this turn.
Crew 2

Breach (Whenever this deals combat damage to a player, you may have it become an Aura Curse until your next turn. Attach it to that player.)
At the beginning of your end step, you may choose a cursed opponent. If you do, draw a card unless that player pays 2 life for each Curse attached to them.

Dafiqi Falconer gets +X/+X, where X is the amount of life you've gained this turn.
As long as your life total is greater than your starting life total, Dafiqi Falconer has flying.

Identity — As long as you control at least two other creatures that share a creature type with Danuri Eaglerider, Danuri Eaglerider gets +1/+2 and has flying.