Warhammer is probably thousands of years old. That would have been a secret wizard game. Same as magic the gathering. And it’s Ben called many things as it is today. Magic, Pokemon, yugioh those are more or less the same game. Those are wizard games. Those games would have been top secret.
Why? Because imagine a medieval peasant in those times stumbling onto a group of wizards having a friendly game of warhammer would have obliterated their minds. It would have been alien and shocking to them.
Also dice/cards were usually illegal because you knuckle heads can’t not gamble yourselves into a demon infestation. Typical playing cards are either for boring old lady games or illicit activities. A wizard buddy wouldn’t have those types of cards. Same as dice etc. now everyone loves those types of games and can understand them.