Sorry to revive a dead thread, but I just had to chime in, I love the Invisible-Deck It's a real mystifier. I performed the trick on my toughest critic, my wife. It was the first time she said "wow!" in response to one of my performances. She's still bugging me to tell her how I did it. Sorry dear, I took an oath.
The basic performance is you shuffle an imaginary "invisible" deck of cards, then have the person you perform for cut or shuffle the imaginary deck. Ask them to pick out a card and tell everyone what it is. Then you take the "card" and turn it upside down before returning it to the deck. Slip the ID in your pocket, say the magic words, and pull out a real deck (which was hiding there all along of course). Fan it out. Every card is face up but one. Spectator pulls out that card, and lo and behold, it's the one they selected from the ID.
I won't reveal the secret here, but it's very easy to perform and works every time. If you can subtract from 13, you can do this trick.
I'd love to hear from others any variations in performing this great trick.
(Edited slightly by Mods)