Lumi, Hateweaver Supreme

Hexproof, Haste, Double Strike
When Lumi, Hateweaver Supreme enters the battlefield or attacks it deals damage equal to it's power to a random creature you don't control, then tap that creature.
{5}{r}{r}: Lumi deals damage equal to it's power to a random opponent and 2 damage to each creature that player controls. For the rest of the game, that player cannot gain life.