I bought a deck of these cards (from England), and they do not work very well.
- images are not visible during card game
- impossible to spot during normal hand movement
- the images are poorly placed and require too much concentration to spot during mental effects
E-mail me for the website, or buy mine. I have studied magic eye techniques and have several effects in the working using this principle and a program I have that generates magic eye images. The effect will work well for jumbo card effect mentalism. firstname.lastname@example.org