Horcrux

Indestructible
You may have as many Horcrux cards in your
deck as you want.
Equip {b}{b}: You cannot equip Horcrux to a
white, blue or green creature.
Equipped creature cannot leave the battlefield.
You cannot equip more than one Horcrux to a creature.When you equip Horcrux, destroy target creature.
When you unnequip Horcrux deal five damage to previously equipped creature.