https://github.com/open-duelyst/duelyst

Duelyst was a very popular online card game that shutdown around 3 years ago. The developers have recently released it into the public domain (via CC0 license).

You can completely selfhost a private instance (repo has a good straight forward guide)

There is a public instance available to try https://duelyst.org/. Though it might be pretty barren.

There is also a closed fork which should have a more active userbase https://duelyst2.com/, the game rules are a little different (draw 2 vs draw1), but should have more users to get a feeling for the game.

The game in a nutshell is basically Hearthstone on a chessboard. It’s very fun and approachable and in my opinion one of the best cardgames right next to MagicTCG :). Hopefully the community for it will grow more and we can have a sort of second renaissance for it :)

chess roguelikes games are great. Breathe new life into a very comfy ruleset:). Always interesting to see how the design space of chess is expanded

couple of examples https://store.steampowered.com/app/1972440/Shotgun_King_The_Final_Checkmate/ https://store.steampowered.com/app/2065000/Chess_Survivors/ https://store.steampowered.com/app/2096510/The_Ouroboros_King/