Mjölnir

This is Thor's Hammer which is made from uru metal which was forged by the black smith Etri in the heart of a dying star.
Mjölnir is only wielded by the worthy and that is why other people cannot wield it.
Mjölnir comes when you have sacrificed two cards to save one it will have an attack boost of 50% when he is used with a thor card. you are able to use Mjölnir twice in one round.