Ulamog, the Defiler (Retro) [Modern Horizons 3]

Cost: 10 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.