Digging through the card assets on itch, this might be the ideal one. Large cards are 352x512 and the small cards are 66x96, a h:w ratio of approximately 1.455 but clean Power-of-Two. Very happy I got it before it goes paid (because it should).
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Although it is not specified, screenshots are size one for the Pocket Cards (I'm going to clarify this and for this very page too 🧐).