Ulamog, the Defiler (Borderless) (Serial Numbered)

When you cast this spell, target opponent exiles half their library, rounded up. Ward—Sacrifice two permanents. Ulamog, the Defiler enters the battlefield with a number of +1/+1 counters on it equal to the greatest mana value among cards in exile. Ulamog has annihilator X, where X is the number of +1/+1 counters on it.