Ulabog

When you cast Ulabog, destroy target permanent. Annihilator 4 Ulabog is indestructible. When a permanent would leave the field, that permanent’s controller creates a 6/5 Bogstomper Beast token for each permanent that left the field. When Ulabog is put into a graveyard from anywhere, its owner shuffles his or her graveyard into his or her library and its controller takes control of all Bogstomper creatures on the battlefield.