I did find this game which involves cards and deckbuilding gameplay: https://itch.io/jam/brackeys-15/rate/4313129
If you're interested in stuff similar to Slay the Spire in terms of unique synergies, combat, and stuff, but not exactly a card game (though heavily inspired by some in the genre), you can check out ours: https://vespulix.itch.io/fletch-quest