Canon is an any-card prediction system. A spectator names any of the fifty-two cards, it’s removed from the deck, and the magician’s wallet is shown to contain the same card, and that card only. Or the card is in an envelope. Or the same card with a different colored back is found in a card box. I can now say without bragging that this system is excellent as I was informed it was created by Belgian mentalist Jan Bardi in the 1980s! I had no idea, and I am of course happy to give him credit for this dastardly principle. The prop he marketed back then is different from mine, but it is his solution. I bow to you, Mr. Bardi.
Canon is $40 and I will pay postage domestically.