Sokath, Bonebreaker

Flying
Overpower - When Sokath, Bonebreaker enters the battlefield, you may search your library for a card,
put it into your hand, then shuffle your library.
Sacrifice Sokath, Bonebreaker at the beginning of the next end step.
Whenever Sokath, Bonebreaker dies, if another creature you control died this turn, return Sokath,
Bonebreaker to the battlefield under its owner's control.