Show to spectator that is a regular deck.
The deck is shuffled. Now the spectator can choose any card of the deck. Free selection!
The selected card is signed and lost in the deck. Now the magician misses for two times the signed card. For the spectator's surprise a blank card came out from the deck.
No problem, with Printer Box you can print any card you need!!
Put the deck inside the box and the transformation is done!!!
Pull out the card from the deck showing that the blank card has turned into the signed card!!!