A card is selected from a regular deck (say the Eight of Spades). A prediction envelope is displayed and four jumbo cards (7"x4.5") are removed in a stack.
The face card is the Ace of Hearts. The spectator is asked if he selected the Ace of Hearts. When he answers no, the cards are fanned as you say, "How about the Ace of Spades?, Ace of Diamonds?, Ace of Clubs?," showing all four aces in a fan.
The fan is closed as you say, "But the suite of one of these aces does match your card, right?" When the cards are re-spread in a fan one of the aces has suddenly turned face down. It is seen to be the Ace of Spades.
The spectator agrees that his card was a Spade. "…Now for the first time, name your card." When the spectator yells out the Eight of Spades you pretend that you heard the Ace of Spades. "…The Ace of Spades? I thought you said that you did not pick an ace.... Oh! the Eight of Spades."
The fan is turned over to show that the Ace has changed into the selected Eight of Spades. All four cards can be shown on both sides at the end.