Have a card freely selected and signed.
Flip the card face down as you talk about angels, specifically the two angels on the back of the deck.
Give the card a shake and both angels visually vanish from the back of the card, leaving just two blank spaces!
It looks absolutely unbelievable. So visual!
In the blink of an eye both angels reappear back on the card!
The card is then given to the spectator to keep. It is their signed card.