Psych, Thought Eater

-1: Target opponent reveals their hand and exiles all noncreatures nonland cards. Put a loyalty counter on Psych for each card exiled this way.
-4: Target player discards two cards. You create an X/X Dementor creature token with Shadow, where X is the number of cards in this player's hand.
-10: All players discard their hands and their maximum hand size becomes 0 for the rest of the game.