So, I got really bored and made a spreadsheet that details a bunch of different stats, as well as the rarity of each card. I don't know all the details, but it appears that card boosters are "printed" in batches, and within those batches there are only a limited number of cards per level type, or something like that. There is also some other basic information on the cards within the document, but nothing groundbreaking. Figured I'd share this with yall.
Attatched is an excel document, and if you don't have excel there is an .rtf document that you should be able to open with something more basic. If you're still having problems let me know and we'll figure something out.