Pugicorn's Gaze

Put target attacking creature on top of its owner's library. If Pugicorn's Gaze wasn't cast from your hand, fateseal 1. (Look at the top card of an opponent's library, then you may put that card on the bottom of that library.)
Hex {w}{u} (You may cast this card face down as a
2/2 creature for {3}. You may cast it from the battlefield any time you could cast it from your hand for its hex cost.)