A card is selected (free choice), signed and returned to the pack.
You then remove from your pocket a matchbox which you open to show some matches and have one removed.
You reassemble the matchbox leaving it on the table in full view.
You ask the spectator to light the match and you extinguish the flame by riffling the pack towards it stating that this action has caused their signed card to turn over in the pack. You spread through the pack face up to show indeed there is a face down card in the middle of the pack, but when turned over it is seen to be the wrong card.
You say you will try again and ask them to open the box and remove another match only for them to find that inside the box is a folded card, their signed card.
Instant reset for next table / group.