Three red backed cards are shown and only you, the magician knows their identities. A blue backed deck is introduced, and th red cards are placed one by one, face down into the pack. The spectator then looks through the face up pack, and calls out three cards. These selections - not forced - are removed from the deck. They are the ONLY red backed cards in the pack - which is ribbon spread on the table to prove it!
Uses only one deck. No sleights. No forcing. Master it in minutes. Seriously.