The magician says "I will find the 2 black jacks also"

The Janus Predictions - Ray Grismer

the effect became known as The Curry Unsolved Card Problem

Designed with the generous feedback and help of some of Britain's top magicians - the idea was to get the genuine look AND FEEL of a standard A4 Euro notebook

and Real World Tips throughout

The Vault - Dropped | Madison Hagler & Rich Piccone - (Download) Larry The magician says "I willInvisibly switch one folded playing card for another! Madison Hagler and Rich Piccone have teamed up to bring you a release four years in the making. Effect: Show a card box, place it on the table, and insert a folded card slightly inside. Tell your audience that the card might come in handy later. Have a spectator sign a selected card, lose it inside the deck, and have the spectator shuffle the deck. The spectator subsequently looks for their card