I recently saw a sales post on a local group page that jogged my memory about having encountered the Action Cards... before I encountered the Action Cards. See, in the mid-to late-80s, Transformers (and really kid-marketed anything) was big enough locally that various food brands, even smaller ones, would leverage those things as freebie pack-ins, way more than they do today. I note the difference because one such pack-in was from some random company (that I'm pleasantly surprised to see is
seemingly still around), selling individually-packed pieces of otherwise-unremarkable fruit candy. Imagine the little ramune disc in a Kabaya/SMP kit except with different fruit flavors... and packed in with smaller versions of the MB Action Cards!
I remember being brought along as a kid on the typical interminable relative visit -- to a relative who had a little general store with these -- and having to pay up after basically eating my weight in candy to get to these things (which, upon review, I now realize are also mentioned on the wiki). I did feel guilty enough, despite the bill being settled, to not take the cards home. This might be why I'd largely buried the memory, heh, and part of why it was so exciting to get those full-sized Action Cards.
What a cool thing to get as a pack-in with a random piece of candy, especially when it would have been simpler and cheaper to just print a one-sided card with the artwork and character's name somewhere. Whether in their full size or as these 2"-at-best mini cards, these were a simple but effective way to get a dose of the brand and its lore. An excellent profile, paired with the striking packaging artwork of the character. And all for the price of a piece of candy, which was perfect for a kid whose parents couldn't really afford to indulge him his every ridiculous toy whim. (And I don't blame them at all; decades later I can't afford my whims either.)