Visions by Matthew Wright

An envelope is placed in full view. A spectator is asked to imagine they are drawing a picture in their mind... it is a free choice and exists only in their mind. Next, a deck of cards is shown and all the cards are shown to be different. The spectator chooses a card. The envelope is opened and inside... paper-clipped to your business card is an exact match of their selected card. The spectator is suitably impressed, but they are soon astounded -- the card is turned over and their thought-of picture is shown to be drawn on the back of the card! 

This is a self-working, self-contained, instantly resettable pocket miracle. There are no difficult sleights, no pocket writing, no stooging, no memory work, and it is 100% reliable. Everything you need fits inside a deck of cards plus the envelope (which comes supplied, but is optional in performance).