Many magicians know the effect, where the magician holds up a jumbo card stating that on the face of the card would be the card named by a spectator in the audience. A nice gag because when the magician turns over the jumbo card, everybody will see that all playing cards are printed on the face, therefore the named card can also be found. The effect is good for a laugh, but it is not magical.
Micha Fritzen took up the idea and added the magic to it, that - after the gag and for the surprise of the audience - the chosen card really appears on the back of the prediction. It is printed on top of the back design, that was visible the whole time.