I'm not sure it comes from one at all. It is said to be linked back to Ancient Egypt by the early French Occultists who popularized it. I've also heard it was originally a card game created as a parlor trick during the Victorian craze of occultism. The Ouija Board and medium-stage shows also became popular around this time. Most of it was for laughs and entertainment, however. The true mysteries of Tarot will remain ever-clouded; perhaps that's the way it's supposed to be.