Yup, it managed to select one after loads of random clicking. So it's possible the 'pixel' to click is somewhere random. I got the right option and I think I wanted it, so click rightish?

This last game I wanted left, but couldn't make it pick. Wound up conceding to save time. And then it annoyed me enough to finally look into it.

Well hello stranger across the internet having this issue in the future: best of luck and have a wonderful life.

Same happening to me. I'm on PC. I have the borderless art for the card, but I'm experiencing the same issue. I even Alt+F4'd Arena and when getting back into the game, I still could not select.