Good question! Astrologians do not wake up with a deck, but they do wake up with a gacha coin, which they are compelled to use immediately after they're bullied by the vending machine to drink their inoculation juice. Upon use, the vending machine will spit out a deck of the player's choice, whatever you think would best suit your character. It can be a tarot deck or a different kind of deck if you'd like. The only rule is that it should have cards representing the Balance, Bole, Spear, and Spire, but representing is the key word here — feel free to get creative with it!

Also, there's a nonzero possibility of Astrologians and only Astrologians finding bracer chasers that have a compartment with which to hold their deck, because that's hilarious.