Zyge, Savior of the Dead

Whenever a creature you control is put into a graveyard from anywhere, you may return it to the battlefield under your control. If you do, sacrifice Zyge, Savior of the Dead.
Sacrifice a creature: Return Zyge, Savior of the Dead from your graveyard to the battlefield under your control.
Whenever a creature you control dies, put a +1/+1 counter on Zyge, Savior of the Dead