Helyn, Scion of Contempt

+1: Exile the top card of your library. You may play it this turn. If a spell is cast this way, each opponent loses 1 life.
-2: Select target permanent. Its controller shuffles it into their library, then discards the top card from their library.
-7: Opponents reveal the top ten cards of their library; you may have them discard all non-land cards and shuffle their library.