Bolas, Conscript of Emrakul

This spell can't be countered.
Devoid, flying, trample, annihilator 2
Ward {4}
At the beginning of your upkeep, fateseal 2.
Exile another creature you control: Return target nontoken creature from a graveyard to the battlefield under your control.
{x}{r}{r}, {t}: Bolas deals X damage to every other creature.
His pre-mending powers, now fully restored