Rainbow Deck Uday
The magician displays a pack of cards which all have different back designs. He removes two cards for himself, then hands the pack to a spectator. The spectator may deal as many cards as they like onto the table and the magician places one of his cards face up at that spot in the deck. This process is repeated with the magician's other card. The magician retrieves the deck and spreads it across the table, then removes his two face up cards along with the cards right next to them in the spread. Surprisingly, even though the spectator dealt the cards himself and could stop at anytime, the magician's cards have the same back design as those right next to them! Even more amazing is the fact that the faces of cards match as well! But most amazing of all is the fact that when the magician turns the pack face up and spreads it across the table, all of the cards are seen to be black court cards!"
Uday's Magic World