Boxing Match by Masuda

Remove a deck of cards from its case.

Place the joker into the otherwise empty card box.

Shuffle the deck and ask a spectator to select a card.

Pick up the still open card case and show the Joker still inside.

Flick your finger against the box. Instantly, the Joker changes into the chosen card!! The box is otheriwse empty.

The change is completely startling. Boxing Match is 100% self working. A beautiful piece of magic.