Man, the compression nuked the image quality

I have the same issue with card face compression, not sure how to get around it. But FWIW your card looks great!

What compression do you mean? PNGs should be lossless! Personally, any time I'm snowflaking I will take the screenshot and resize the working image to 200x300 before I begin the fancy editing. That way I know what I'll have as my end product without any surprises.