One of the most clever routines by Nick Trost.
In effect, two regular-size playing cards are shown. Each card has a matching miniature card paper- clipped to it. Each pair of cards is turned face down, then the miniature cards are exchanged so that the pairs no longer match. After a "mystic pass," the cards are turned up and once again the miniature cards match the regular ones. The effect is repeated immediately!
Easy to do. Resets itself. Complete with all the necessary cards and clips.