msem-instigator

Put target creature on top of its owner's library.
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.)

Menace
Whenever Algrin's Legacy becomes the target of a spell an opponent controls, that spell's controller loses 5 life unless they discard a card.

When Limbhacker Blade enters, each opponent discards a card.
Equipped creature gets +2/+0.
Equip {2}

Whenever Mei's Student deals combat damage to a player, fateseal 1, then scry 1. (Look at the top card of an opponent's library, then you may put it on the bottom.)

Destroy target tapped creature, then untap all creatures you control.

Destroy all creatures. If a Reflection would be destroyed this way, its owner shuffles it into their library instead.

If an opponent would draw one or more cards, that player instead draws that many cards plus one, then exiles a card from their hand.
You may play cards exiled by Curated Citations, and you may spend mana as though it was mana of any type to cast them.

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
Enchanted creature gets +2/+1.
Sacrifice a creature: Enchanted creature gets +2/+2 until end of turn.

I, II — Each opponent loses 2 life and you gain 2 life.
Discovery — At the beginning of your end step, you draw a card and you lose 2 life.

Target creature gains indestructible until end of turn.
Fuse (You may cast one or both halves of this card from your hand.)

If Madame Beatrice would leave the battlefield, exile her instead.
Whenever one or more creatures you control deal combat damage to a player, that player reveals their hand. You may cast a card from their hand without paying its mana cost.

Reach (This creature can block creatures with flying.)

Once each turn, when you cast a spell, you may note one of its card types that hasn't been noted for Enter Captain Minnow. If you do, create a number of tapped Treasure tokens equal to the number of types noted for Enter Captain Minnow.

Whenever a nontoken creature you control dies, you may pay that creature's mana cost. If you do, search your library for a card and put it into your hand, then shuffle.

Once each turn, you may activate an additional loyalty ability of a planeswalker you control.
[+1]: You gain 1 life for each loyalty ability you've activated this turn. Scry 1.
[0]: Put a +1/+1 counter on target creature. It can't attack or block until your next turn.
[–3]: Exile target creature with power 4 or greater.

Hopeful Healer gets +1/+1 and has lifelink as long as you are glorious. (You are glorious as long as you have a glory counter.)

Rain of Blood deals 3 damage to each creature and each player.

Amass Soldiers X. You gain life equal to the greatest power among creatures you control. (Put X +1/+1 counters on an Army you control. It's also a Soldier. If you don't control one, create an 0/0 black Soldier Army creature token first.)

{T}: Look at the top and bottom card of your library. Put up to one on top of your library and the rest on the bottom in any order.
{2}: Mill a card.

First strike
When Hunted Haunt dies, create a 1/1 black Scout creature token.

Target creature gets +2/+0 and gains first strike until end of turn. If it's attacking a battle, it gains double strike until end of turn.

Lifelink (Damage dealt by this creature also causes you to gain that much life.)
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

{T}, Pay 1 life: Add {W} or {U}.
{1}, {T}, Sacrifice Cleared Vault: Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Flash
When Thraben Redeemer enters, choose up to one target permanent card in your graveyard that was put there from the battlefield this turn. Return it to your hand.

At the beginning of your end step, if a card left your graveyard this turn, create a 3/1 black Human Rogue creature token named Shengin Renegade.