The variation of the sandwich trick has two freely selected cards that you and the spectator, or two spectators if you have an audience, can select. One is lost in the deck and the other disappears, a place in the deck is selected where the cards might be then the two cards magically appear in the other hand. The ACAAN trick has a freely chosen card then lost in the deck, the spectator guesses how far its from the top but its not the card, the deck is handed to the spectator so they can deal the cards since it's their card (in the video I do it) and the card is found.