Mjölnir, Storm Hammer - Legendary- Inverted- Etched (Etched Foil)

When Mjölnir enters the battlefield, attach it to target legendary creature you control.
Whenever equipped creature attacks, tap target creature defending player controls and put a stun counter on it. Then Mjölnir deals damage to each opponent equal to the number of tapped creatures that opponent controls.
Equip {4}