The Rules to a card game named Assumption.
EDIT to additionally add:
if you haven't read Tim Powers' novel Last Call and you like card games, urban fantasy, or the 30s/40s aesthetic? You REALLY should read it, it's a phenomenally good book.
I have read Tim Powers' novel Last Call
I would like to join a party of 13 in playing Assumption
I know there's at least 4 of you who'd be game (including myself and flatmate, here). I figure once we find our 13, we can pick an evening that works for everybody.
EDIT to add:
we will NOT, repeat, NOT, be playing with the Lombardy Zeroth tarot deck (or any other tarot deck): I am going to pick up a tarocchini deck (which is just the 56 suit cards) to use for this. Heck, if the author himself flees the building when people are playing Assumption with tarot cards...