Set up a flat surface or table about 4 feet away from the viewing audience. This trick works best on a smooth surface.
Set up your deck of cards by placing all of the aces on top of the deck. Place a dummy card on the very top of the deck. Any card other than an ace works as the dummy card.
Start the trick by pulling the first five cards off the deck. Show the audience the four aces, but keep the dummy card behind the top ace. This makes the audience think there are only four cards in your hand. Slide the rest of the stack of cards off to the side. They aren't needed until the end of the trick. Stack the aces back together, making sure the dummy card is on top.
Hold the stack of aces with the dummy card on top in one hand with the card's image facing down. Show the audience the stack of cards, and lay the ace with the dummy card on top of it face down on the table. Lay the other three aces in a row beside the ace with the dummy card face down on the table. Practice, so this part looks smooth. If it looks awkward, the viewers notice the stacked cards. You want the audience thinking only one card is in each stack in the row.
Lay your hand on the stack of cards on the side, curve your palm like you are picking up a card. Lift your hand up and act like you are looking at a card. Then look surprised, and show the audience an empty hand. The key is to ham it up a little, and make the audience really think there was a card in your hand.
Slam your hand down onto the top of the dummy card with the ace under it. Hit your hand slightly sideways on the card, so the dummy card slides to the side. Lift your hand, and the audience notices the second card. Turn the cards over, so the audience sees that the dummy card isn't one of the original cards shown at the beginning of the trick. Practice slamming the hand down, so the card looks like it just mysteriously appears.