You ask the spectator

"What was your card?" The name it.
You show the box empty, and slowly something appears inside, it is their card!

This is the kind of magic that you can easily make by yourself!
Appearing a prediction?
Make a card vanish then reappear inside the box?

Now you can do it and add it into your repertoire

What are you waiting for?

Welcome to "Devil Box" by Ido Daniels