This is a very visual effect. Magically transfer writing from a card to your hand. Have a card selected (not forced), have it signed on the face, and then make a mark on the back. Wave your hand over the card and suddenly the mark has vanished from the card. It has transferred to the palm of your hand. Hand out the signed card as a souvenir.
The gimmick is easy to make and only requires a bit of arts and crafts with the usual supply for card gaffing.
1st edition 2022, video 15 min.