Marked by Jonathon Dreyer
A card is freely selected and signed and cut back into the deck. The magician states that the deck is marked, and reveals a card by reading the back markings. The magicians asks the participant to try to find their card by reading the back. The deck is spread, and one red card is visible in the blue deck. "I've made it easy for you!" states the magician. When the red card is shown, it is indeed the signed selection! As a finale, the magician makes the red back disappear, leaving the signed selection with a blue back! The card is given away as a souvenir.
This is an excellent routine that comes complete with the gimmicked deck and photo illustrated directions.