What are the abilities of Ulamog, the Infinite Gyre?
user
When you cast this spell, destroy target permanent.\nIndestructible\nAnnihilator 4 (Whenever this creature attacks, defending player sacrifices four permanents.)\nWhen Ulamog, the Infinite Gyre is put into a graveyard from anywhere, its owner shuffles their graveyard into their library.
assistant