I have a Collection of "Dark Force" cards. This was once a trading card game located within the universe of the german RPG System "Das Schwarze Auge" (DSA) (Realms of Arcania / The Dark Eye).
At the time when the publisher, Schmidt Spiele, went bancrupt, Fantasy Productions (FanPro) bought all of the existing DSA portfolio and decided not to continue this game anymore. Therefore it is a rarity nowadays.
I have never found people who would want to play it with me, since I discovered this game long after its "fall".
I haven't played it ever, but went on collecting these cards, just because they look good and represent images of the DSA world.
I plan to create once a website with a small archive of it, someday in the future.
By the way, with the decline of Fasa, FanPro bought almost everything (as far as I know) of the Battletech RPG System. They are now the maintainers (right word ?) of it.
Links to Dark Force (mostly german) :
If you are interested, yozu can take a look there how they look(ed).