Srclss, Reality Warper

Flying
Whenever a player casts a spell from his or her hand, you may have that player exile it, then exile cards from the top of his or her library until he or she exiles a card that shares a card type with it. That player may cast that card without paying its mana cost. Then he or she puts all cards exiled with Srclss, Reality Warper on the bottom of his or her library in a random order.