

It’s been a minute since I last tried it, but: Forge: The Magic: The Gathering Rules Engine https://card-forge.github.io/forge/ & https://github.com/Card-Forge/forge
It’s essentially MTG: Shandalar - but free & opensource. So basically you start with some starter deck, roam the lands to defeat color-coded wizards and dungeons for ante-cards and money (which you use to just buy cards from vendors), build deck, and ultimately defeat the elemental gods etc. Shandalar. :)
The game has actual MTG cards (can be downloaded via the game’s menus).




Just a hunch, but it’s not performance why peeps are migrating away from windows