Dravos, Corrupted

{p/c}{p/c}{p/c}{t}:Exile a creature from each opponent's graveyard. Dravos, Corrupted gains power and toughness equal to the total power and toughness of the exiled creatures until end of turn.
At the start of combat if Dravos, Corrupted's power and toughness are each greater than ten untap it. It gains Annihilator X where X is equal to its power.