Nintendo is still, at its core, a playing card company. Having family friends as a kid who went to Japan on occasion, I ended up with many Nintendo-made trump

Nintendo is still, at its core, a playing card company. Having family friends as a kid who went to Japan on occasion, I ended up with many Nintendo-made trump card decks that featured, among other things, Mario, Pokemon, and at one point, a JAL-branded one while growing up. I don't know if the current Club Nintendo trump decks are made by them, but I can tell you that if you run into a Nintendo-branded Hanafuda set, it's probably legit.