Nightmare Wander

+2: Target Player reveals their hands. You may play one card reveal this way without paying the mana cost.
+2: Target Player gains 4 life and mills 3 cards. You may play any card that was milled this turn. All mana color cost is colorless until end of turn
-10: Exile all cards but 10 from a player library. You may Play any card exiled. If you do,pay x life instead of mana cost.