Ulamog, the Infinite Gyre
From the Vault: Legends — Mythic
Legendary Creature — Eldrazi
When you cast Ulamog, the Infinite Gyre, destroy target permanent.
Annihilator 4 (Whenever this creature attacks, defending player sacrifices four permanents.)
When Ulamog is put into a graveyard from anywhere, its owner shuffles his or her graveyard into his or her library.