Giant Raven

Flying. Fear.
Bad Omen--(Whenever Giant Raven deals
combat damage to an opponent, that opponent
reveals the top X cards of his library, if any of those revealed cards is black, all creatures of that opponent
get -X/-X, until end of turn, where X is Giant
Raven's power.)
Hellbent-- (If you have no cards in your hand, this creature gets +2/+1).