Mjolnir, Thor's hammer

worthy one (this artifact or equipment can only be equipped by a creature that also has worthy one)
equipped creature gets +10/+0, if equipped creature with Mjolnir, Thor's hammer is destroyed or exiled, exile Mjolnir. if a creature with worthy one is in your hand or on the battlefield. return Mjolnir, Thor's hammer to your hand.
"whosoever holds this hammer, if he be worthy, shall possess the power of thor." -Odin