To finish the effect

And with what Alakazam added

You explain that they will use their subconscious to deduce the identity of the jumbo card they are sitting on

can perform impossible effects with card signed by the spectators

they say £2

Foolproof Card Tricks | Karl Fulves Ernesto To finish the effectMaster the art of illusion with this collection of 183 easy to learn card tricks, accompanied by 197 illustrations. Drawn from two popular books by the bestselling magician, it's perfect for amateurs and professionals who want to increase their repertoire. Mystify friends with everything from shuffle setups to card telepathy, using coins, telephones, and other props. Pages: 136 Softbound