Mjolnir

equip {0}
mjolnir can only equip thor
mjolnir can only be equiped if thor has defeated a villain with power 4 or greater
equipped creature gain +5/+5 and flying when it attacks
{r} {t} deal 2 damage to any target
unequip mjolnir- deal 5 damage to target creature and search your library for a red instant card