A demonstration of cheating.
The spectator chooses four cards totally at random and puts them face down between two red Kings who are face up.
Then the spectator puts this little packet on top of the deck. After the magician cuts and shuffles only one time, the cards between the red Kings now are the four aces! With only one shuffle, the magician manages to switch the four indifferent cards with 4 aces.
1st edition 2023, video 11:31