Distended Mindbender

Emerge [5][B][B] (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's converted mana cost.)

When you cast Distended Mindbender, target opponent reveals his/her hand. You choose from it a nonland card with converted mana cost 3/less and a card with converted mana cost 4/greater. That player discards those cards.