msem-instigator

You may put a creature or Revelation card from your hand onto the battlefield. Exile that permanent if it would leave the battlefield. If it's a Revelation, it enters as a Horror creature.
Coalesce {7}{U}{U} (You may cast this from your graveyard for {7}{U}{U}. If you do, it enters as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)

Nightshaper's Domain enters tapped.
{T}: Add {B}.

You may cast Elemental spells as though they had flash this turn.
Whenever you cast an Elemental spell this turn, draw a card.

Flying
Once each turn, when an opponent draws a card while they have more cards in hand than you, you may draw a card.

Flash
Flying
Menagerie — Whenever Sigilwing Familiar deals combat damage to a player, if there are five or more creature types among creatures you control, draw a card.

When Queue Bouncer enters, return target creature to its owner's hand. If you control another Actor, instead put that creature on top of its owner's library.

Heretic (Whenever you cast a spell that doesn't share a color with this creature, it gets +1/+1 until end of turn.)
{1}{B}: Lost Dancer becomes black and gains lifelink until end of turn.

[+1]: Reveal the top card of your library and put that card into your hand. You lose life equal to its mana value.
[+1]: Until end of turn, Lucien, the Grifter becomes a legendary 3/3 black and red Human Warrior creature with deathtouch, lifelink, and indestructible.
[–3]: Exile target artifact or creature. You gain life equal to its mana value.

As an additional cost to cast Scavenger's Skill, you may reappropriate. (To reappropriate, exile exactly two cards from your hand and/or graveyard.)
Scavenger's Skill deals 3 damage to target creature or planeswalker. When that permanent dies this turn, if Scavenger's Skill's additional cost was paid, draw a card.

Whenever Determined to Prevail or another artifact or enchantment you control enters, target creature you control gets +1/+1 and gains indestructible and vigilance until end of turn.

Precursor Sanctum enters tapped. When it does, look at the top three cards of your library, exile one face down, then put the rest on the bottom of your library in any order.
{T}: Add {C}.
{4}, {T}: You may play the exiled card without paying its mana cost. Activate only as a sorcery.

{T}: Add {C}.
{7}, {T}: Create a 2/2 colorless Spirit creature token.

Target creature you control explores. Then it fights up to one target creature you don't control. If that creature has flying, the creature you control deals damage equal to its power to it instead. (Reveal the top card of your library. Put it into your hand if it's a land. Otherwise, put a +1/+1 counter on that creature, then you may put that card in your graveyard.)

Lumbering Stoneshell has hexproof as long as it's untapped.

Each opponent sacrifices a creature. For each creature sacrificed this way, create an Idol token. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)

Exile target card from a graveyard. If you exiled a creature card this way, you gain 3 life. Otherwise, surveil 2.
Flashback {2}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

{T}: Add {U}.
{U}, {T}: Target creature gains flying until end of turn.

As an additional cost to cast this spell, you may tap any number of untapped tokens you control. This spell costs {1} less to cast for each token tapped this way.
Whenever Organic Dreadnought enters or attacks, tap target permanent an opponent controls. That permanent doesn't untap during its controller's next untap step.

As Floodwater Depths enters, you may pay 2 life. If you don't, Floodwater Depths enters tapped.
{T}, Sacrifice Floodwater Depths: Search your library for an Island or Swamp card, put it onto the battlefield, then shuffle.

Whenever Apostle of the Spirit Moon becomes blocked by a creature, Apostle of the Spirit Moon deals 1 damage to that creature and that creature's controller.

At the beginning of your end step, you may put a progress counter on Armored Transports.
[PROGRESS 1-2] Creatures you control get +0/+1.
[PROGRESS 3+] Creatures you control get +0/+1 and have vigilance.

Whenever another Hound you control enters, put a +1/+1 counter on Greypelt Initiate.

Hexproof
Discard two cards: You may cast target instant or sorcery card in your graveyard this turn. If that spell would be put into a graveyard, exile it instead.
At the beginning of your end step, if you have two or fewer cards in hand, transform Fahrib.

{T}: Add {C}.
As long as Shengin Heartland is in your graveyard, lands you control have “{T}: Add {G} or {U}.”

Mark (Whenever this creature attacks, mark target creature until end of turn.)
Whenever a marked creature dies, you lose 1 life and you draw a card.