Snape The Double Crosser

+1: search your library for a good/bad witch/wizard and add it to your hand then shuffle your library.
-3: search your library for a potion with a converted mana cost 4 or less and play it without paying the mana cost then shuffle your library.
-11: exile all nonland permanents your opponent controls and return 5 target creatures exiled by Snape under your control until end of turn.