Crota's Soul

Pay five life or sacrifice three creatures, put a soul counter on Crota's Soul.
If Crota's Soul has ten soul counters on it sacrifice
it. Crota's Soul deals 20 damage divided amongst
three or more players or creatures.
When Crota's Soul enters the graveyard, you may
exile it. If you do, search your library for a card
named Crota, Son of Oryx and put it onto the battlefield. Crota's Soul destroys all creatures all opponents control but one of your choice.