msem-instigator

Flying, deathtouch
Whenever an opponent loses life for the first time each turn, that player loses 1 life and you gain 1 life.

Monstrous Amalgam gets +X/+X, where X is the number of creature cards in your graveyard.
{B}, Reappropriate: Put a +1/+1 counter on Monstrous Amalgam. Activate only once each turn. (To reappropriate, exile exactly two cards from your hand and/or graveyard.)

Whenever you gain life, you may put target creature or planeswalker card from your graveyard on top of your library.

Deception {B} ({B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Lifelink
{1}{B}: Nimunotian Shadow gets +1/+1 until end of turn.

Lifelink
Whenever you gain life, each opponent loses 1 life.

Whenever Ravaging Tyrant enters the battlefield or attacks, each opponent loses 3 life, discards a card, and sacrifices a creature or planeswalker.

Target creature gets -2/-2 until end of turn.
{3}{B}, Exile Rift Splicing from your graveyard: Aetherize target creature card with mana value 3 or less in a graveyard. Activate only as a sorcery. (To aetherize, create a token that's a copy of it, then exile that token.)

Flying
Whenever one or more other creatures die for the first time each turn, journey. (To journey, exile the top card of your library face up. Whenever a creature you control deals combat damage to an opponent, put a journeyed card you own into your hand.)

Flying, lifelink
Whenever you gain life, you may have target creature get -X/-X until end of turn, where X is the amount of life you gained.

Deathtouch
When Shadowed Apostle dies, draw a card.

Until end of turn, if a source you don't control would deal damage to you or cause you to lose life, mill that many cards instead.

Creature cards in your graveyard have revive. The revive cost is equal to their mana cost. (Pay that creature's mana cost, Exile that card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

As an additional cost to cast this spell, torment yourself. (You lose 3 life unless you discard a card or sacrifice a nonland permanent.)
Destroy target creature.

Choose two —
• Scry 3, then you may mill up to three cards.
• Each opponent loses 3 life.
• You draw a card and you lose 1 life.
• Return a creature card from your graveyard to your hand.

Menace, haste
Whenever Tiger of the Drums attacks, choose one —
• Exile target opponent's graveyard.
• You draw a card and lose 1 life.
• Torment each opponent. (They lose 3 life unless they discard a card or sacrifice a nonland permanent.)

Each player loses 3 life, then discards a card, then sacrifices a creature, an enchantment, a land, a planeswalker and a token. Then exile all graveyards.

All creatures get -2/-2 until end of turn. Remove two loyalty counters from each planeswalker.

When Undead Banneret enters the battlefield, if you control a legendary creature, each opponent loses 4 life.

Flying
When Unfettered Atrocity enters the battlefield, destroy target creature or planeswalker.

Whenever one or more other nontoken creatures die, create a Food token. (It's an artifact with “{2}, {T}, Sacrifice this artifact: You gain 3 life.”)
Whenever you sacrifice a Food, create a 1/1 black Bat creature token with flying.

This spell costs {2} less to cast if it targets a creature or planeswalker card with mana value 3 or less.
Return target creature or planeswalker card from your graveyard to the battlefield.

Deathtouch
At the beginning of your end step, create a 1/1 black Rat creature token with “This creature can't block.”
{1}{B}, {T}, Sacrifice three other creatures: Each opponent discards a card and loses 2 life. You draw a card and gain 2 life.

Whenever a nontoken creature you control dies, create a 1/1 black Skeleton creature token.

This spell costs {2} more to cast for each target beyond the first.
Choose one or more —
• Anax's Endeavor deals 2 damage to any target.
• Destroy target nonbasic land. Its controller may search their library for a basic land card, put it onto the battlefield tapped, then shuffle.
• Destroy target artifact. Scry 1.

Whenever you cast a noncreature spell, Architect of Calamity deals 2 damage to each opponent.