Variant of focus when playing in Whist

In order to fulfill this trick when playing in Vista , take a deck and prepare it for the game in a special way: fold the deck in such a way that every fourth card is a trump, for example, tref. Replace the deck to play the prepared deck. Make a bridge. Then ask one of the players to take off the deck and make the volt on the bridge. This will return the cards to their original position. Now hand over the cards and you will have all the trump cards.