Cuttle: Two player battle card game played with a standard 52-card deck of cards (cuttle.cards)

And it’s open source.

https://github.com/cuttle-cards/cuttle

You can read the rules here: https://www.cuttle.cards/rules

And watch competitive play on the cuttle-cards youtube channel: https://www.youtube.com/@cuttle-cards2245

The community for this game is really cool and I'm glad that I've been playing this game for over 3 years now!