Ulamog, the Infinite Gyre

Mana Cost: {11}
Total Cost: 11
Type: Legendary Creature — Eldrazi
Description: When you cast this spell, destroy target permanent.
Indestructible
Annihilator 4 (Whenever this creature attacks, defending player sacrifices four permanents of their choice.)
When Ulamog is put into a graveyard from anywhere, its owner shuffles their graveyard into their library.
Power: 10
Toughness: 10