msem-instigator

Choose target creature you don't control. When that creature dies this turn, draw a card. Target creature you control fights that creature.

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

Flying
When Skystream Mantas is returned to your hand from the battlefield, draw two cards.

Choose X —
• Return target spell to its owner's hand.
• Scry 3.
• Draw a card.

Target player mills three cards for each poison counter they have.

Choose up to one target land card and up to one target creature card with mana value 3 or less from your graveyard. Return one to the battlefield and the rest to your hand.

Interan Soothsayer gets +1/+1 for each other green creature you control.
{G}, {T}: Put a +1/+1 counter on target green creature.

Destroy target artifact or nonbasic land.

Defender, reach

When Chiseled Familiar enters, draw a card.
Sacrifice Chiseled Familiar: You gain 2 life.

Whenever Infernal Barrier is dealt damage, it deals 1 damage to each opponent.

Exile target creature. That creature's controller reveals cards from the top of their library until they reveal a creature card. That player puts that card onto the battlefield, then shuffles the rest into their library.

Vigilance, trample
Prized Marshcroaker can block an additional creature each combat.

Untap target land. Scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)
Fabled {3}{G}{G} (Then if you cast this for its fabled cost, put it onto the battlefield transformed attached to that land.)

Prismatic — Whenever you cast a multicolored spell, you may discard a card. If you do, draw a card.

Prevent all combat damage that would be dealt to and dealt by target creature this turn.
Inscribe {2}{U} ({2}{U}: Exile this card from your hand inscribed on a creature you control. Whenever that creature attacks, its controller may cast a copy of the inscribed card without paying its mana cost. Inscribe only as a sorcery.)

Trample, haste
Crew—Tap three untapped artifacts and/or creatures you control.

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

Incendiary Flow deals 3 damage to any target. If a creature dealt damage this way would die this turn, exile it instead.

Destroy target tapped creature.

Flying
At the beginning of your upkeep, you may create a token that is a copy of target Aura you control and attach it to target permanent or player it could enchant.
{2}, Sacrifice an Aura: Artiaburz gains indestructible and hexproof until end of turn.

Prowess
Grizzled Stoker can't be blocked as long as you control an artifact.

Gain control of target creature until end of turn. Untap that creature. It gains lifelink and haste until end of turn.

Fire and Ashes deals X damage to any target. If a creature dealt damage this way would die this turn, exile it instead.

At the beginning of combat on your turn, target creature you control with flying gets +1/+1 until end of turn.