Probably one of the finest mechanical marvels Dr. Schwartz has ever invented, so easy to do.
Imagine this: A card is elected signed and placed back into the pack. The deck is placed into the card box and the box is sealed inside a plastic Ziplock bag. You stand away from the bag. The card box is in full view. The bag is covered with a hank. How could the signed card possibly be found under these impossible conditions.
After a magicial gesture the hank is removed and a gasp is heard from the audience. The deck of cards has mysteriouslyleft the card box with no possible explanation. The spectator can now open the bag and remove the card box.
To their surprise the signed card is in the box. Applause follows as you take a well-deserved bow. A must have effect.
Very easy to do. Totally mechanical. Complete with video instructions.