Kasami, Revenant Scourge

Deathtouch, First Strike
Morbid — At the start of your End step, if a
creature died this turn, you may return Kasami, Revenant Scourge from the graveyard to the battlefield.
Whenever Kasami, Revenant Scourge enters the battlefield, each player sacrifices a creature.
"He marches for eternal vengeance."