Flash

Whenever a creature you control dies, each opponent sacrifices a creature of their choice.

When this creature enters, each player sacrifices a creature of their choice.

Whenever a creature enters, its controller sacrifices a creature or land of their choice.

When this creature enters, each player sacrifices a creature of their choice.

When this creature enters, each player sacrifices a creature of their choice.

Squad (As an additional cost to cast this spell, you may pay any number of times. When this creature enters, create that many tokens that are copies of it.)

When this creature enters, each player sacrifices a creature of their choice.

Whenever you sacrifice a black creature, you may pay 2 life. If you do, each other player sacrifices a creature of their choice.

Whenever you sacrifice a green creature, you may gain 2 life.

When this enchantment enters, create a 4/4 white Angel creature token with flying and vigilance.

Whenever an Angel you control dies, each other player sacrifices a creature of their choice.

Whenever this creature deals combat damage to a player, that player sacrifices a creature of their choice.

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Animate Chains — When this creature enters, each player sacrifices a nontoken creature of their choice.

When this creature enters, each player sacrifices a creature or planeswalker of their choice.

When this creature enters, you become the monarch.

Whenever you become the monarch, target player sacrifices a creature of their choice.

, Sacrifice another creature: Put a +1/+1 counter on this creature.

Whenever a creature you control with a +1/+1 counter on it dies, draw a card.

Each player sacrifices two creatures of their choice.

Flying

When this creature enters, draw a card if a creature died this turn. Otherwise, each player sacrifices a creature of their choice.

Whenever another creature you control dies, put a +1/+1 counter on this creature.

When Meathook Massacre II enters, each player sacrifices X creatures of their choice.

Whenever a creature you control dies, you may pay 3 life. If you do, return that card under your control with a finality counter on it.

Whenever a creature an opponent controls dies, they may pay 3 life. If they don't, return that card under your control with a finality counter on it.

Flying

Whenever a player sacrifices another permanent, put a +1/+1 counter on each creature you control.