Brainstealer Dragon [Outlaws of Thunder Junction Commander]

Set: Outlaws of Thunder Junction Commander Type: Creature — Dragon Horror Rarity: Rare Cost: {5}{B}{B} FlyingAt the beginning of your end step, exile the top card of each opponent's library. You may play those cards for as long as they remain exiled. If you cast a spell this way, you may spend mana as though it were mana of any color to cast it.Whenever a nonland permanent an opponent owns enters the battlefield under your control, they lose life equal to its mana value.