This is positively a great improvement of an old trick where a playing card changes to a matchbox.
This version has a unique but simple locking mechanism that makes the matchbox look like a real thing and enables the performer to handle it freely all around. Just show a playing card in your hand and cover it shortly with the other hand and voila! The card has changed to a matchbox.
What makes this oldie worth performing is the presentation, where the card is displayed as a prediction of a selected card, but is wrong. So you change it to match!
Easy to perform, complete with routine.