msem-instigator

As an additional cost to cast this spell, sacrifice any number of creatures.
Target player loses 2 life for each creature sacrificed to cast Blood Lashing.

At the beginning of your upkeep, reveal the bottom card of your library, then you may pay {B} and 3 life. If you do, put it into your hand. Otherwise, exile it.

Choose one —
• You draw two cards and you lose 2 life.
• Target player discards two cards and you gain 2 life.

Whenever Cavern Monstrosity attacks, exile the bottom card of your library. You gain life equal to its mana value.

When Clawing Shaman enters from your graveyard, you may exile it. If you do, return all creature cards from your graveyard to the battlefield.
{4}{B}{B}{B}, Sacrifice a creature: Return Clawing Shaman from your graveyard to the battlefield. Activate only as a sorcery.

Target creature gets -4/-4 until end of turn.

Each player reveals their hand. Choose a creature card revealed this way. Its owner discards it.
{2}{B}{B}, Exile Cranial Violation and six other cards from your graveyard: Put target creature card from a graveyard onto the battlefield under your control. Activate only as a sorcery.

Target creature gets -2/-1 until end of turn. When it dies this turn, its controller loses 5 life.

Target creature and all creatures with the same name as that creature get +2/+1 and gain lifelink until end of turn.

Lifelink
Revive {5}{B}{B} ({5}{B}{B}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

Enchant creature an opponent controls
Whenever enchanted creature attacks or blocks, fateseal 1. (Look at the top one cards of an opponent's library, then put any number on the bottom and the rest on top in any order.)

At the beginning of your upkeep, each player loses 3 life unless they sacrifice a creature.
Sacrifice a creature: Fateseal 1. (Look at the top one cards of an opponent's library, then put any number on the bottom and the rest on top in any order.)

As an additional cost to cast this spell, sacrifice a creature.
Create three 1/1 black Worm creature tokens.

When Fatethief dies, put the bottom card of your library into your hand.
Revive {2}{B}{B} ({2}{B}{B}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

Whenever a nontoken creature you control dies, create a 1/1 black Worm creature token.
Sacrifice Fertile Grave: Create a 1/1 black Worm creature token.

Whenever Fickle Feeder blocks, fateseal 1. (To fateseal 1, look at the top card of an opponent's library, then you may put it on the bottom of that player's library.)

Reveal the bottom card of your library. You may put it on top of your library. Target creature gets -0/-X until end of turn, where X is that card's mana value.

Search target player's library for a card and exile it. Then that player shuffles.

When Last-Thought Feeder dies, fateseal 2. (To fateseal 2, look at the top two cards of an opponent's library, then put any number of them on the bottom of that player's library and the rest on top in any order.)

Whenever a creature enters, destroy it unless its controller pays 3 life.

Deathtouch

Target player sacrifices a creature. Fateseal 1. (To fateseal 1, look at the top card of an opponent's library, then you may put it on the bottom of that player's library.)

Whenever Ravencaller or another creature enters from your graveyard, create a 1/1 blue Bird creature token with flying.

Indestructible
When Reflected Worldwalker enters, each player puts their hand into their sideboard.