The magician divides a deck into two parts and raffles the cards by placing half face up and half face down.

When you extend them, you can see the mix with the cards in different positions

 

The spectator picks up one of the cards that appear face and introduces it in the deck, in the place that wants, but now face down.

 

The surprise is that when the full deck is turned, the chosen card is the only one that is upside down in every deck.

 

Said letter can be signed or delivered as a souvenir

A special deck and video on line with instruction in Spanish