Ulamog, the Infinite Gyre [Modern Masters 2015]

Set: Modern Masters 2015 Type: Legendary Creature — Eldrazi Rarity: Mythic Cost: {11} When you cast this spell, destroy target permanent.IndestructibleAnnihilator 4 (Whenever this creature attacks, defending player sacrifices four permanents.)When Ulamog, the Infinite Gyre is put into a graveyard from anywhere, its owner shuffles their graveyard into their library.