Woebringer Demon

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

Flying

At the beginning of each player's upkeep, that player sacrifices a monocolored creature of their choice.

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

At the beginning of each player's upkeep, that player sacrifices an artifact, creature, or land of their choice.

Flying

At the beginning of each combat, any opponent may sacrifice a creature of their choice. If a player does, tap this creature and put a +1/+1 counter on it.

Flying

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