You give your spectator a small black envelope to place in their pocket. You ask your spectator to name any number between 1 and 52. You give your spectator a deck of cards and ask them to deal down to their chosen number. They stop at their chosen number. You ask them to open the untouched envelope.
The card matches the card at their chosen number!
Deck can be examined!
No switching of card or envelope!
Easy to perform!