Your spectator removes a card, and it is placed it in the middle of the deck. When a magical signal is given, the card rises to the top of the deck. If you attach a sticker to the card and give a signal, the card becomes half transparent in front. Once again, if you cover it with your hands, the card selected by the spectator magically turns into a transparent card.
No special skills.
Signs or stickers can be attached.
Transparent card can be presented as a souvenir.
You can see the process of the card's becoming transparent right in front of your eyes.