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Whenever a creature you control dies, each other player sacrifices a creature of their choice.
Enchant creature
When enchanted creature leaves the battlefield, its controller sacrifices a creature of their choice.
Whenever a creature enters, that creature's controller may have target creature of their choice get -3/-3 until end of turn.
When this creature enters, each player sacrifices a creature of their choice.
Flash
Whenever a creature you control dies, each opponent 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 or planeswalker of their choice.
Trample
Whenever a source deals damage to this creature, that source's controller sacrifices that many permanents of their choice.
Animate Chains — When this creature enters, each player sacrifices a nontoken creature of their choice.
Green creatures can't attack unless their controller sacrifices a land of their choice for each green creature they control that's attacking. (This cost is paid as attackers are declared.)
Whenever another creature enters, its controller loses 1 life.
When this creature enters, any player may sacrifice two creatures of their choice. If a player does, sacrifice this creature.
When this creature enters, you become the monarch.
Whenever you become the monarch, target player sacrifices a creature of their choice.
When this enchantment enters, sacrifice all creatures you control.
Creatures you control get +2/+2.
Flying
When this creature enters, sacrifice a land.
Exploit (When this creature enters, you may sacrifice a creature.)
When this creature exploits a creature, each opponent sacrifices a creature of their choice.
(As an additional cost to cast this spell, you may pay 
