Really cool concept! It makes me think of TABS. Great art, and lots of different cards and units. Great job!
Unfortunately, I think the "deck" (pun intended!) is really stacked against the player - I always got totally destroyed. Although, strangely, I couldn't fully lose either? Like, they'd kill all my characters, and get to my castle and endlessly attack it, but I'd never get "game over", I'd just have to reload the page.
(Also, it's always nice to see a WebXR build!)