Would you mind sharing the name of those 3 games?
Oh boy, this'll be !fun! to try and remember.
The obvious one is TF Card Battle.
https://f95zone.to/threads/tf-card-battle-v1-23-apollo-seven.23001/
It's a text-based HTML game based around using basic cards to gain resources to purchase more powerful cards. As the name would suggest, relevant fetishes are heavily Transformation and specifically male-to-female based. Fun, but I could never figure out any strategies or tactics when playing, leaving victory heavily RNG-based.
There's another Unity game, not dissimilar from this one, except you're using a deck entirely composed of human minions, fighting against Succubi and stuff. It's also extremely untranslatable, having tons of dialogue that I think is locked to auto-scroll? ...I remember dropping it because I was playing a normal card game and my opponents were playing Succubus Reborn... plus it didn't have a ton of content.
Right, it's called Succubus Duel... and is abandoned. Oh well.
https://f95zone.to/threads/succubus-duel-demo-irojikake-matome.99494/
I remember another card game, this one in RPGmaker... of all engines. It's a more Yugioh sort of deal, with monsters and spell cards. I remember dropping it because you start with a Goblin deck, and you got new cards as random drops by fighting people, and I immediately wanted a full Hucow deck when they were the second enemies I encountered, but would have to grind so much... I also think the gameplay wasn't that engaging? I dunno, it didn't leave a big impression...
While searching, I stumbled across Succubus Connect. I... don't remember that much while playing it, other then a distinct lack of H-content.
https://f95zone.to/threads/succubus-connect.82620/
Same with Last Evil, which I remember dropping after getting frustrated with it... don't remember why that clearly...
https://f95zone.to/threads/last-evil-v3-0-0-flametorch.47693/
...Okay, on deeper reflection, there's a lot of porn card games. Notably, I skipped plenty of card games that were just strip poker or whatever, so there's probably... fifteen, twenty of them here? ...Still would be a big ask for a tag.