Aldreia, Wayward Alter

Undying.
Whenever Aldreia, Wayward Alter leaves the battlefield, create X 2/2 black Zombie creature
tokens where X is equal to the amount of times Aldreia, Wayward Alter has left the battlefield
this game.
You may sacrifice a creature to return Aldreia,
Wayward Alter from your graveyard to your
hand.