Hildr, Mistress of Battle

Flying, Hexproof
{3}: Creatures you opponents control get -1/-1
until end of turn.
{4}{b}, {t}: Regenerate any number of creatures.
When Hildr, Mistress of Battle dies, target
opponent creates a token artifact equipment
named, "Hildr's Helmet" that has equip {3}
and equipped creature gets +2/+2.