Ulamog, The Reborn

When you cast this spell, exile two target permanents.
This spell can't be countered.
Indestructible, Annihilator, Haste, Vigilance, Hexproof
Whenever Ulamog, the Ceaseless Hunger attacks, defending
player exiles the top twenty cards of their library.
{t} Create 5 Eldrazi beast creature tokens