So, what do you do when you've always wanted to make a card game but at the same time you should also keep this game updated. Time wise it would take quite long to make a full standalone card game and then even longer to make new ways to die horribly in this game. Three months ago I was pondering how to resolve this time issue. Maybe I could use 6 months to make a card game and then update this in early 2021 perhaps. What I came up with was a compromise, I decided that I won't make a full standalone card game and I'll limit the new ways to die horribly to just one. Then I gave it a deadline, August 31st, and applied my own JFDI project model on it (just ... do it). There's still 10 days to go to the deadline but I'm out of juice so here it is. So, yeah, there's now a collectible card game in the game and in order to play the card game, you have to find a card album in a locked chest (picking the lock is required).
Once you have found the card album, it will lead to a short quest that allows you to use the card album (the album's description tells you what to do in each step).
Once you complete the quest you can fully enjoy the card game and die horribly many, many, many times.
Note that there's no manual for the card game at this point. There's dozens of rules that you just have to figure out on your own. There could be a manual at some point in the distant future but I'm not making any promises. Also note that this is what I consider casual content and it can be completed on all difficulty levels. You may be squashed like a bug on the windscreen a few dozen (hundred?) times but it can be done casually.