Necromancer's Locket

{b}{b}{b},{t}: If Necromancer's Locket is not
attached to a creature, return target creature
from your graveyard to the battlefield and attach
Necromancer's Locket to it. If the equipped
creature dies, exile Necromancer's Locket.
Equipped creature has deathtouch.
At the beginning of your upkeep put a -1/-1
counter on the equipped creature.