Method:
Begin by shuffling the deck and let a spectator choose a random card. When the spectator is looking at his card casually flip the bottom card over, then flip the deck over so it looks like the top.
Next, have the spectator’s card replaced loosing it in the deck. What the spectator doesn’t realize is that the chosen card is now facing down in a face up deck.
Take the deck and put it behind your back. While the deck is behind your back, flip the top card back over to normal. When you are doing this, tell the audience you will magically find the chosen card.
Give the face down deck back to the spectator and tell them to look through the deck.
Your spectator’s card will be the only face up card in the entire deck!