Using a borrowed deck the spectator freely chooses a card, signs it, puts it back in the deck and mixes the deck. Then he places the deck inside his own pocket. This gives the magician any number from 1 to 52 to choose from.

The spectator's choice is absolutely free.

The magician now slides his hand into the spectator's pocket and withdraws the signed card that had been lost in the deck!

Bonus:

A brand new version of "Knife Through Card" that can be performed with the same gimmick!

Needs no technique
Gimmick included
You will need a standard Bicycle deck (not included)