Diamond Deck trick
"Diamond Jim Tyler's Diamond Deck Trick An eye-popping routine from start to finish! The deck does all the work, yet everything is examinable! EFFECT: The spectator names a card, only to find it has a different back from all the others in the deck. Another spectator names a different card, but wait a minute! The deck has changed color and the second thought-of card also has an odd colored back! Before your spectators can recover, the faces of the cards change from all red cards, to all black cards, then back to completely normal again! Your spectators begin to question their sanity, but there's still more! For the stunning climax, cut the cards into two face-up piles and spread. One half now contains all red cards with one black selection, while the all black half contains the red selection. But, this is not all! When you turn the halves face-down, one half has all red backs and the other half has all BLUE! Take a second to look at this...The selections' backs are of the opposite color! Comes complete with photo-illustrated instructions and a very special Poker Bicycle deck."
Meir Yedid Magic