Ulamog, the Ceaseless Hunger is a mythic Legendary Creature — Eldrazi card from Commander Masters (CMM), collector number 5. Current market price: $23.23 (foil $25.23), TCGplayer market prices via Scryfall.
When you cast this spell, exile two target permanents. Indestructible Whenever Ulamog attacks, defending player exiles the top twenty cards of their library.