Flying, lifelink, hexproof from planeswalkers Boast — {1}{B}, Sacrifice a creature: Each opponent sacrifices a creature or planeswalker. (Activate only if this creature attacked this turn and only once each turn.)

When Abyssal Gatekeeper dies, each player sacrifices a creature.

Flying Whenever Butcher of Malakir or another creature you control dies, each opponent sacrifices a creature.

When Fleshbag Marauder enters the battlefield, each player sacrifices a creature.

As an additional cost to cast this spell, sacrifice a creature. Flying Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) When Goremand enters the battlefield, each opponent sacrifices a creature.

When Merciless Executioner enters the battlefield, each player sacrifices a creature.

When Plaguecrafter enters the battlefield, each player sacrifices a creature or planeswalker. Each player who can't discards a card.

At the beginning of your upkeep, each player sacrifices a non-Vampire creature.

Flying At the beginning of each opponent's end step, that player chooses up to two creatures they control, then sacrifices the rest.

Mutate {4}{B} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.) Whenever this creature mutates, each opponent sacrifices a creature.

At the beginning of each player's upkeep, that player sacrifices a non-Elf creature.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.) At the beginning of your upkeep, return target creature card from your graveyard to the battlefield. At the beginning of each opponent's upkeep, that player sacrifices a creature.

Deathtouch At the beginning of your end step, if you gained life this turn, each opponent sacrifices a creature and you return up to one target creature card from your graveyard to your hand.