You hold your hand out in a closed fist, and you tell the spectator to think of one card in the deck. They can change their mind as much as they want. Under those impossible conditions, you reveal just ONE card folded in your hand. What card were they thinking of? Jack of Diamonds? You open the card - it matches.
A signed, selected card is visibly, audibly TORN and completely restored - in the spectator's OWN hands. You can even have the spectator tear it themselves. The card is then COMPLETELY restored. Once restored, the spectator can examine the card - and keep it forever.
A completely impromptu Torn & Restored Card miracle. A card is torn piece by piece, then restored individually back together. It is never switched, and there are no duplicates. A single card miracle.