Here is a PDF of the card in Acrobat Pro, properly formatted. This is what I sent to my printer.
In the meantime, I want to have another print/play company turn around a quick copy of the game I can use for the summer conventions. They want the cards in JPEG format, so I import the PDF into Affinity (I tried both Publisher and Photo):
Notice that the title font got messed up (even though it shows as Cambria Bold 14 pt in both programs) as well as the cube font. I build the cubes in InDesign using grep, which isn't yet available in Affinity, so that explains the cubes but I'm not sure about the card title.
This has caused me to export from InDesign to JPEG, to avoid the font problems altogether. But I find that even though I export at 300 dpi:
Affinity Photo loads it as 72 dpi:
Since I wrote my original post, I found that if I export to JPEG from Acrobat instead of from InDesign, it loads as a proper 300 dpi image in Affinity, so I'm past this problem.
Any input you have on the font issues would be appreciated. I'd love to simply load the PDF into Affinity Photo, and for some files I can do that, but the fonts for this game seem to cause problems for Affinity. I'm trying to make the switch off Adobe, but things like this require that I maintain the Adobe subscription.