Ravensto the Blind

+1: Look at the top card of your opponent's library. You may exile it face down. For the rest of the game, you can look at face down cards.
0: You may exile a card from your hand face down. If you do, draw a card.
-2: You may cast one face down exiled card this turn. If it's an instant or sorcery, shuffle it back into it's owners deck afterwards.