Flim-Flam by Wild-Colombini Magic - Trick

In effect, one unknown card is put aside, then five other cards are shown to be blank on both sides. The performer claims that he will magically print three of the blank cards to match the unknown card. One by one, three blank cards change to ten-spots. But when the unknown card is shown, it is a four, so obviously a mistake has been made. However, when the three tens are shown again, these have changed to fours, so now all four cards match. Easy to do. Complete with all the cards.