Grim Reapers Scythe

“Whenever one or more creature cards leave your graveyard, create a 2/2 black Zombie creature token.<br> 3B, T, Sacrifice two creatures: Return target creature card from your graveyard to the battlefield with a finality counter on it. Activate only as a sorcery. <em>(If a creature with a finality counter on it would die, exile it instead.)</em>”