I don't main Astrologian, but one of my major fascinations with the lore in FFXIV has been the Deck of Sixty. Having read that section in the Encyclopaedia Eorzea and some of the information about the deities and elements, I feel like there's a lot of potential for the deck of sixty as a legitimate system of divination (as legitimate as any other one anyway) as well as a useful deck for card games. I've also personally message LootCave to encourage them to produce a full deck, which they currently have no plans to do, but do not seem to have ruled out.
In terms of card games, there is plenty of information in the EE to produce a full deck and put together the games described (I feel like I should do more reading o tarocci for some of these to figure out how the majors works for that). Further, the only major stumbling blocks I see to using the full deck for divination is a lack of clear meanings for the numbered and court cards. My current line of thinking is that the pip cards would line up as elemental combinations based on the number and suit, the only remaining systemic question being which element to associate with each number. For the courts, I'm kind of at a loss. For tarot, the courts fill the role of elemental combinations, and the set of three courts per suit makes this especially challenging as everything is generally in sixes for this elemental system. Knave/Lord/Lady easily transition to Child/Man/Woman (ignoring the gender issues at play), so maybe these would line up with youthful, masculine, and feminine interpretations of each suit? Then a valid question becomes what masculine and feminine mean in the setting and whether this lines up with the passive/active dichotomy of the light/dark elements (yin/yang) in their representation in Taoism and Qaballah (or at least the occultist interpretation thereof). As I write this, I think that might actually work, though the rearrangement of the courts from the Tarot tradition makes me wonder if the masc/fem should be inverted from the occult traditions I'm familiar with.
Anybody else fascinated by this? I made a full deck out of labeled index cards and hope to build a functional system for divination out of this, but my first priority is not to contradict the canon lore in any way. I'd love more lore on this, and need to finish leveling AST.