Presto Magix (some people call it Presto Magic) were art-type activity sets that was popular during the 1970s and 1980s. The sets were published by the American Publishing Company from Waterford, Connecticut.
Presto Magix were usually a comic book formatted set which contained a sheet of rub-on decals and a background. You would place a figure on the page where you would want it and then rub over the picture with a pencil or similar object. Then the picture was transfered to the page. Presto! Larger, boxed sets were also available.
Many popular television shows and movies of the era such as Jabberjaw, Yogi Bear, Dynomutt, Laff-A-Lympics, Masters of the Universe, E.T. the Extra-Terrestrial, Star Wars, G.I. Joe, The Incredible Hulk and many others were featured on Presto Magix sets. The WWE, then known as WWF, also licensed Presto Magix.
Not to be confused with Colorforms.
What's it worth? Take a look at this Presto Magix price guide: sold listings for a value indication.