I'm not sure if one exists out there, but I'd like to see one that has the back of a card with the image of the face/pips of another superimposed but reversed on it and possible faded...
Think of holding up the gaff card to a user that is say, the Queen of Hearts, as if you are getting ready to announce that the Queen is their selected card, only to say that the four of clubs is their card. When they ask how you knew that (maybe a little patter to suggest they should ask), show them the back of the card and provide patter about how sometimes the "ink" on a bad run comes off. (hide some ink somewhere to smudge on your fingers???) Then show them the card that was sitting on top of it, revealing their card. It's a double reveal!
Now...how to keep the back of that card obscured during use is another question to ponder.
-MM
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