Uchbenbak, the Great Mistake {3}{U}{B}

Legendary Creature — Skeleton Horror

Vigilance, menace

Descend 8 — {4}{U}{B}: Return Uchbenbak, the Great Mistake from your graveyard to the battlefield with a finality counter on it. Activate only if there are eight or more permanent cards in your graveyard and only as a sorcery. (If a creature with a finality counter on it would die, exile it instead.)

6/4