If you're willing to ruin a card, you can add more yet. Secretly have a self-sticking sticker of some sort: say a Gold Star. After the original packet has been false-shuffled and a packet cut off and set aside without counting, again have the spectator note the top card. Take the packet from her and secretly add the gold star to the face of the top card, in the process of shuffling the cards, leaving the top card in place. There are several different decent ways to handle this. Tell the spectator she will get a Gold Star if she succeeds at this. Then proceed as above. At the end, there is only one card left face-down. When she turns it over, it's not only her card, it now has a Gold Star on the face. Again, the number matches the number of cards in the other packet.
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