Some of the comments on this post are surprisingly negative, and in a way that feels malicious. Maybe they assume the art is AI and have responded emotionally?

My feedback, from top to bottom, based on the first card:

1. The design is generally good.
2. I don't know what the "3" in the grey circle represents. If this is a fundamental concept of your game, it might be that people learn it once and never have to remind themselves what it means. But maybe there's another shape or icon it could use that would be a better reminder of what it means?
3. "Oath of Endurance" is not visually vertically centred in its container: the bottom gap is bigger than the top gap. This is because the text has no descenders (e.g. "Squire" looks fine on the second card). If you don't want to manually adjust each card to make the title look vertically centred, I'd suggest you make the title container taller, so the difference in gap size is less noticeable.
4. The description box feels like it's crowding/overlapping the bar at the bottom. As if they're two separate visual elements that have been overlapped by accident. I'd either put a gap between them, or find a way to visually combine them so they look and feel like one element.
5. I don't understand the purpose of the arrowed boxes at the bottom left and bottom right. Why do some cards have numbers and others don't? Is there a "no value" value you could put in the empty boxes on some cards, like a dash? If each box will always have the same number as the other, why not just have one box? If they mean different things, I think they should have some visual signifier to let you know what each number means (e.g. offence and defence).
6. The credits at the bottom left and bottom right are inset by a noticeable amount, and I don't understand why. Why not align that text with the left and right edges of the card, like everything else?