msem-instigator

When Kalak Culler enters, each opponent loses life equal to the number of creatures you've sacrificed this turn.
Revive—{3}{B}, Sacrifice a creature. ({3}{B}, Sacrifice a creature, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

Return up to one target creature you control and up to one target creature you don't control to their owners' hands.

(Transform this if it's not attached to a creature. Pay {1}{R} as a sorcery to unattach it.)
Enchant creature you control
Scale Bearer's rider gets +4/+3 and has flying and haste.
Whenever Scale Bearer's rider attacks, you may pay {2}{R}. If you do, it deals damage equal to its power to target creature or planeswalker.

{T}: Add {C}.
{2}, {T}: For each color among cards in your graveyard, add one mana of that color.

Deathtouch
When this creature enters, if you cast it, target creature card in your graveyard gains arise until end of turn. Its arise cost is equal to its mana cost. (Exile that card from your graveyard and pay its arise cost as a sorcery: Create a black token copy of it that's also a Zombie and can't block.)

{3}{B}: Judge another target creature you control. Activate only as a sorcery. (Honor it by putting a +1/+1 counter on it or condemn it by sacrificing it to draw a card.)

Wesgoth Cemetery enters tapped.
Whenever a nontoken creature dies, put a corpse counter on Wesgoth Cemetery.
{T}: Add {B} or {G}. If there are thirteen or more corpse counters on Wesgoth Cemetery, remove those counters, transform it, then untap it.
Wesgoth Cemetery can be your commander.

First strike
Thailen, Heir to Daeland's power is equal to the number of other attacking or blocking creatures you control.

When Fading Memories enters, exile target creature card from a graveyard.

Put target nonland permanent on top of its owner's library.
Draw a card.

Exile target creature you control, then return that card to the battlefield under its owner's control.
Draw a card.
Foretell {1}{U} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

Equipped creature gets +0/+2.
Whenever equipped creature blocks, you may pay {B}. If you do, target player loses 1 life.
Equip {2}

Renown 1 (When this creature deals combat damage to a player, if it isn't renowned, put a +1/+1 counter on it and it becomes renowned.)
When Grizzled Captain becomes renowned, create two 1/1 white Soldier creature tokens.

Enchant creature
When Ethereal Fervor enters, adjudicate. (Create a white Aura enchantment token with enchant creature and “Sacrifice this token: Untap enchanted creature” attached to target creature.)
Enchanted creature gets +1/+0 for each Aura attached to it, has first strike, and attacks each combat if able.

Flying
At the beginning of your end step, put a +1/+1 counter on Lepidopteradator if you're horrific. Otherwise, sacrifice it. (You're horrific as long as you've sacrificed a permanent or discarded a card this turn.)

Nameless Throng can't block.
{1}{B}, Exile an artifact or enchantment card from your graveyard: Return Nameless Throng from your graveyard to the battlefield.

Flash
When Ambush Gharial enters, it fights up to one target creature. If that creature would die this turn, exile it instead.

When Recognification Process enters and at the beginning of your upkeep, create a token that's a copy of target artifact you control, then sacrifice an artifact.

Deathtouch
Whenever a storied permanent you control enters, remove up to two counters from target creature or planeswalker an opponent controls. (Enchantments and legendary permanents are storied.)

Return target spell or creature to its owner's hand.
Quickdraw {U} (When a creature you control blocks or becomes blocked, you may cast this spell for {U}.)

Flying
Golden age (If you cast an instant or sorcery spell, activated a nonmana ability, and attacked this turn, enter a renaissance for this game.)
At the beginning of combat on your turn, if you're in a renaissance, target creature gains flying until end of turn.

When Medical Mask enters, prevent the next 3 damage that would be dealt to any target this turn.
{4}, Sacrifice Medical Mask: Prevent the next 6 damage that would be dealt to any target this turn.

Whenever a creature enters, if it entered from a graveyard or a player cast it from a graveyard, return Ceaseless Stalker from your graveyard to the battlefield at the beginning of the next end step.

Flying, trample
Whenever Raidragos' Avenger deals combat damage to a player, create a 5/5 red Dragon creature token with flying.
Creatures you control get +1/+0 for each Dragon you control.

Flash
If one or more counters would be put on a creature you control, put that many plus one of each of those kinds of counters on that creature instead.