Merlins of Wakefield - It's always magic at Merlins

You show your audience a circular card that contains the images of many different playing cards. Your spectator makes a completely free choice of any one of the cards. Using a pair of scissors, the chosen card is cut out from the circular card. When everything is turned over, the freely chosen card is the only one with a red back. And, all of the other non-chosen cards have blue backs. Totally amazing method. Complete with scissors and enough Fortune Donut cards for 20 performances.