Amazink by Sebastien Calbry

With Amazink, you will have the possibility to make any writing appear and disappear on the back of a card, inserted into a badge holder, simply by waving it! 
You will also be able to make revelations and changes (characters, shapes, etc.) based on your own inspiration, as the gimmick is fully customizable. 
Finally, you will have the option to create a small token from your badge holder (coin, folded card, etc.) as seen in the video. 

Sebastien Calbry creates an actual creative tool with this gimmick, and offers multiple possibilities. 

It is possible, using a badge holder, to turn it into an extra support by drawing on it to then combine original effects.