I'm pretty happy with it. Are you familiar with that gimmick? If not, it's fine. Just curious. I'll explain the effect.
The hollow box case(the black frame thing), a red deck of bikes and it's box all sit on a table. The deck is shuffled thoroughly and a card is selected. The spectator signs their name across the face and it is placed back into the center of the deck. As the cards are placed into the card box, the spectator can examine the box case. The cards in the card box are shown in then the top is closed. The box(with the cards inside) are slid into the box case.
Immediately, the box case is spun around to reveal the open window showing just the deck of cards which are slid out onto the table. The card case has vanished leaving the cards themselves behind.
The deck is spread to reveal one face up card, the signed selection. When it is turned over, it is shown to have a blue back.
What do you think?