illuminated by light from the card surface

It can also be a part of a longer Rubik's magic routine

Chinese Coins

also known as ESP Cards

But it's not the decks themselves that switch places

USD3 - Universal Switch Device BROWN | Pablo Amira & Alan Wong Caveney illuminated by light from theHimber wallet meets minimalism. Again. Here is a new version of our existing product USD, the Universal Switch Device 3. 0 which functions exactly the same as the original. If you perform Magic or Mentalism, you know that a low tech, nothing to break solution is always the best. Pablo Amira and Alan Wong bring you an easy and elegant solution with the USD. The USD (Universal Switch Device) is a slim, playing card size holder, made from real leather.