The Misfit Deck (online instructions) by Matt Baker

Our friend Matt Baker is one of the cleverest magicians we know. This deck allows for a very interesting premise (and several presentations are included):

The spectator names any card in a deck of 52. This is a totally free, mentally selected card.

The spectator is then instructed to insert a business card into a ribbon spread deck - at ANY position he likes. The card next to the business card is revealed to be exactly the spectator's named card. Not only that, but the selected card is the ONLY different playing card in a deck of duplicates. The presentation is absolutely baffling!