Juan Estrella Flash Corner

The Spectator Choses a card and its lost in the Deck, you “Fail” at finding the selection, but you promise to make something unique.
You tear the corner of the wrong card and ask the spectator to keep it in their close fist, then you fold the card in quarters, with the index of the wrong card still showing , you shake the folded card and this one VISUALLY changes with no cover to the actual selection, at the end they open their fist just to find out that the corner also has changed and now matches the rest of the card!

-IMPROMPTU
-USES ANY DECK
-FAST AS A FLAP
-NO EXTRA CARDS
-DIFFERENT REVEALS
-CAN BE DONE SURROUNDED