**Fun side note: The elemental symbols at the bottom of each card are actually the symbols for the different elemental attributes creatures can have in Studio Ghibli's video game Ni No Kuni. But no one will pick up on a detail that small unless I tell them. It just makes me happy.
Sources
ace. http://www.pixiv.net/member_illust.php?mode=medium&illust_id=41934731
2. official art
3. official art
4. http://www.pixiv.net/member_illust.php?mode=medium&illust_id=16047305
5. http://hetiru.deviantart.com/art/The-rain-of-sadness-and-happiness-587599231
6. official art
7. http://stabat.deviantart.com/art/mononoke-354937576
8. official art
9. http://tiny-mint.deviantart.com/art/The-Cat-Returns-392374726
10. screenshot
page. screenshot
knight. http://www.pixiv.net/member_illust.php?mode=medium&illust_id=24413655
queen. official art
king. http://www.pixiv.net/member_illust.php?mode=medium&illust_id=31803546