msem-instigator

Flying, first strike
Whenever this creature transforms into Flame-Tested Dragon or attacks, it deals 1 damage to each creature you don't control.

Menace
Whenever Flayed Dunerazer attacks or blocks, sacrifice a permanent.

As an additional cost to cast this spell, exile a creature card from your graveyard.

Reach, trample
Whenever this creature transforms into Flourishing Companion or attacks, untap all lands you control.

Vanishing 3 (This creature enters with three time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
When Fogborn Mauler enters or leaves the battlefield, you gain 2 life.

Flying
Disgraced 4 (This enters with four -1/-1 counters. Whenever it deals combat damage to a player, remove all -1/-1 counters from it.)
Whenever you put one or more -1/-1 counters on Forgotten Tyrant, it deals that much damage to any target.

Defender, trample
Tap any number of other untapped creatures you control with total toughness 8 or greater: Formidable Bulkvine's base power becomes 8 until end of turn and it can attack this turn as though it didn't have defender.

Hexproof
Whenever you cast a spell with mana value 5 or greater, each opponent discards a card and loses 3 life.

Lifelink
Frenzied Watchkeeper enters with six -1/-1 counters on it.
At the beginning of each end step, if an opponent lost life this turn, remove a -1/-1 counter from Frenzied Watchkeeper.

Whenever a creature an opponent controls deals damage to you, monstrosity 2. (If this creature isn't monstrous, put two +1/+1 counters on it and it becomes monstrous.)
Frigid Behemoth can't attack unless it's monstrous.

You gain 3 life and you mill three cards.
Coalesce {5}{G} (You may cast this from your graveyard for {5}{G}. If you do, it enters as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)

Vigilance
Warriors you control have ward {X}, where X is the number of Warriors you control. (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {X}.)

Frondpond Prankster can't be blocked.
Whenever Frondpond Prankster enters or deals combat damage to a player, target player reveals their hand, then you choose any number of nonland cards from it. That player puts those cards on the bottom of their library in a random order, then draws that many cards.

When Frontier Savior enters, return up to two target creature cards with mana value 3 or less from your graveyard to the battlefield.

Flying
This spell can't be countered.
When Frostbreath Dragon enters, tap target creature. It doesn't untap during its controller's next untap step.
Whenever Frostbreath Dragon becomes the target of a spell or ability, counter it unless its controller pays {2} and discards a card.

This spell costs {1} less to cast for each creature card in your graveyard.

Untap all permanents you control.
Coalesce {5}{G}{U} (You may cast this from your graveyard for {5}{G}{U}. If you do, it enters as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)
{G}{U}: Untap Fulfill Twisted Dreams.

Flying
Whenever you cast a creature spell, creatures you control get +1/+1 until end of turn.
Whenever you cast a noncreature spell, create a 2/2 red and white Cat Knight creature token.

Wither (This deals damage to creatures in the form of -1/-1 counters.)

Trample
Cycling {2} ({2}, Discard this card: Draw a card.)

Once each turn, when you cast a creature spell, you may copy it for each other spell you cast this turn. (A copy of a creature spell becomes a token.)
Whenever Garragrok, Horde Tyrant attacks, add {R}{R}{G}{G}. Until end of turn, you don't lose this mana as steps and phases end.

Whenever a creature attacks, if its toughness is greater than its power, untap it.

Defender (This creature can't attack.)
Hexproof (This creature can't be the target of spells or abilities your opponents control.)

When Gharsha, Monstrous Quarry enters, each opponent creates a 1/1 green Elf creature token.
Whenever a creature you control becomes blocked, you may pay {1}. If you do, put a +1/+1 counter on that creature.

Trample
When Ghastly Progenitor enters, each opponent reveals their hand. Choose two nonland cards revealed this way. Their owners discard those cards.