God of thunder not hammers

You can only activate this effect if you control Diana, Daughter of Hippolyta or Kal-El, Son of Jor-El. Target one Mjolnir, Uru Hammer your opponent controls and gain control of that artifact until the end of turn. If you control Diana, Daughter of Hippolyta when you activate this effect you may have it become worthy until end of turn. (You can equip Mjolnir without any negative effects)