The Vanishing Ace
The magician shows the audience three aces fanned out in his hand. The ace of diamonds is seen to be between the two black aces. The magician places the three aces into the pack and makes the ace of diamonds magically disappear.
Before you do the trick, remove the ace of diamonds from the pack and hide it somewhere. Take out the ace of spades, ace of hearts and ace of clubs from the pack and lay them face down on the table. Tell the audience that you are about to make one of the aces magically disappear. As you say this, place the pack on the table and pick up the three aces arranging them into a fan which you show to the audience. The two illustrations below demonstrate how the three aces must be arranged so that the middle ace appears to be the ace of diamonds when it is really the ace of hearts.
Say to your audience: "here are the three aces - the ace of clubs, diamonds and spades".
Next, square up the three cards and tell the audience that firstly you will put the ace of spades near the bottom of the pack and insert it face down into the lower part of the pack allowing the audience to catch just a glimpse so that they see it really is the ace of spades. Then say; "and the next card: the ace of diamonds I will place in the centre of the pack". Do this but of course do not let the audience see this card. Then say "finally I will place the ace of clubs face down near the top of the pack" which you do.
Of course by this time the trick is already done as the ace of diamonds is of course not in the pack but wherever you placed it earlier. Allow a spectator to go through the pack to verify that the ace is gone this allows you to reveal the ace of diamonds in as novel way as you wish!