Mongolian Clock Effect: He spectator chooses a card from a "clock" made by...
The Changing Card Variation
Effect: Now not only does the card change, it disappears!
Do the trick exactly the same except for one minor preparation. Place on the top card a piece of double-sided tape. This way, when the spectator places his card on top, it will stick to the other card. Now the card changes, and also vanishes!