Hey Yasmin, thanks for the awesome and detailed post! As I'm sure you know, there are a lot of different ways players can have accessibility challenges, so getting clear reports of what's working well and what's working poorly for individual players is super valuable.
I'm following up with our art & engineering teams about the items you've mentioned (and others collected from the comments here), and we'll see what we can do. The specificity of your feedback ("here's my problem. It applies in these circumstances. Here's what I wish I could do") is very helpful in making it actionable.
You mentioned that you wanted to be able to turn off opponent card styles - You should be able to do this using Options->Gameplay->Hide Alternate Art Styles (bottom of the left-hand list on desktop). If that's not giving you the result you're looking for, please let me know why. We added that option back when we first implemented styles, partly to solve for cases like yours.
T...
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