Joker Magic is known for innovative methods and well-made apparatus. Clone Card fits this description, as well as being very visual and very surprising. A special green plastic card deck holder is shown -- inside is a single deck. I explain that the holder is a common tool used by magicians to keep their decks of cards from being damaged or warped when not in use. The magician takes the blue deck of cards from the holder, and sets the holder on the table. Magician explains that he wanted to use his  deck. Instantly, from out of nowhere, the magician is now holding a red deck in addition to the blue one! He puts the blue deck back in the holder, and puts the holder away. The red deck is normal and ready for use in any routine you choose.