Mjölnir, Hammer of Thor

Legal in Standard, Pioneer, Modern, Legacy, Vintage, Commander

When Mjölnir enters, it deals 4 damage to up to one target creature.
Double all damage equipped creature would deal.
Equip worthy {1} (A creature is worthy if it's a legendary non-Villain that's red and/or white.)
{2}{R}, Discard this card: It deals 2 damage to each creature.