msem-instigator

Reach
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Hexproof
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

When Briarform Apothecary enters, create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”)
Sacrifice a token: Briarform Apothecary gets +2/+2 until end of turn.

Draw a card, then reveal any number of creature or land cards from your hand. You gain that much life.

Whenever you play a land, return a card at random from your graveyard to your hand.
Whenever you cast a green spell, reveal the top card of your library. If it's a land card, put it into your hand. Otherwise, mill it.

Prevent all combat damage that would be dealt this turn.
Create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”)

Haste
When Wretched Merfolk enters, target creature can't block this turn.

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

Each instant and sorcery card in your graveyard gains agonize until end of turn.
Agonize (You may cast this card from your graveyard by putting a -1/-1 counter on a creature you control in addition to paying its other costs. Then exile this card.)

Trample

You may change the targets of target instant spell, sorcery spell, or activated ability.

Tap up to three target lands. They don't untap during their controller's next untap step.
Agonize (You may cast this card from your graveyard by putting a -1/-1 counter on a creature you control in addition to paying its other costs. Then exile this card.)

Pyrophoric Blast deals 3 damage to target creature. If that creature would die this turn, exile it instead.

As an additional cost to cast this spell, pay {2} or reveal an instant or sorcery card from your hand.

Target creature you control deals damage equal to its power to another target creature.
Agonize (You may cast this card from your graveyard by putting a -1/-1 counter on a creature you control in addition to paying its other costs. Then exile this card.)

Destroy target land. Into the Maw of Hell deals 13 damage to target creature.

Enchant creature
At the beginning of combat on your turn, create a token that's a copy of enchanted creature, except it has haste. Exile that token at the beginning of the next end step.

Choose one —
• Exile target artifact.
• Target player exiles two artifacts they control with mana value 0.

Wither (This deals damage to creatures in the form of -1/-1 counters.)
{X}{R}: Hearth Dweller gets +X/+0 until end of turn.

Flying
{3}{R}{R}: Untap all creatures you control. After this main phase, there is an additional combat phase followed by an additional main phase. Activate only any time you could cast a sorcery.

Wither (This deals damage to creatures in the form of -1/-1 counters.)
Instant and sorcery spells you control have wither. (They deal damage to creatures in the form of -1/-1 counters.)

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

If a source you control would deal noncombat damage, it deals double that damage instead.

Target creature gains double strike until end of turn. Mill a card.

Up to two target creatures can't block this turn. Exile the top two cards of your library. Until the end of your next turn, you may play those cards.