WANDERING ACES by Joseph B

In this incredibly direct and impossible effect, the magician is able to find three lost cards in the deck all at once. Three spectators choose a lucky card from a totally normal deck and finally each spectator puts their card back in the deck at a different spot. The magician puts the four aces together in the center of the deck, he makes a magical gesture, and the aces mysteriously separate into the deck to find the cards chosen by the three spectators.
All with a normal deck and totally Impromptu.