On a table, there is a translucent case with a card inside of it.
Ask a spectator to pick a card out of a deck, then sign on the card.
Put the signed card back in the middle of the deck.
Pick up the translucent case and take out the card that's inside.
It is the card which the spectator has signed previously.
This is a great trick to use as the climax of a famous magic "The Ambitious Card," in which a signed card seems to return to the top by a snap of fingers after being placed in the middle of the deck.
It can be examined by the spectator after the performance.
Note: please use a red Back Bicycle deck.
Online instructions (QR code) included.