Ghost-Flame, the Awakened

{t}: Destroy target nonblack creature.
If Ghost-Flame were to leave the battlefield, put a -1/-1 counter on each creature and return Ghost-Flame to the battlefield during your next upkeep.
Tightly grasping the newfound treasure, the once wandering skeleton, was turned into a shell for the ancient necromancer who has been exiled in the form of a sword for centuries.