Maybe we could get clarfication from Donald X.?
I would just look at it in terms of utility in the wiki.
Copper, Silver, Gold, Estate, Duchy, Province, and Curse are cards with no text that come in three products. I would put them together. All other cards I would put with the expansion they come with, even though Base Cards reprints Platinum / Colony / Curse. I would put them after a different delimiter at the end of the list. I could see being redundant and having a Base Cards section in the big links block, with everything that product has, and still also having Potion with Alchemy and Platinum / Colony with Prosperity. Base Cards, it's a product, it has certain cards in it, there you go.
Personally, when it's a card article, I would probably just show the expansion list for that card at the bottom, and a list of other topics for that expansion if there are any, plus a list of expansions, and maybe a list of general topic areas if there is one. The giant block showing every card could still appear on the main page or something. OTOH what does it matter if there's a giant thing at the end of each article, maybe it's fine.
For me the most significant general categories are: free (+1 card +1 action or more), attack, village/throne, remodel/vault (trash or discard for benefit), +buy, non-attack interaction, victory, treasure, trash cards, gain cards. There is a broader useful category of all cards that are fine to get in multiples - +1 action or more, thrones, remodel/vault, victory, treasure. I'm not sure that has any merit for the wiki but it's useful when say writing a program to generate sets-of-10. Similarly you can group attacks with non-attack interaction. And then every expansion has themes that can be categories.
I have not read any Ayn Rand.