The number and suit could tell you if your character won or lost a conflict but drawing a Major Arcana could trigger some unexpected, thematically appropriate event.
Plus: aesthetically perfect for a game about wizards or whatever.
Alternatively, what about a Wuxia / martial-arts themed game that uses I Ching?
Seems so obvious that somebody must have done it, but I can't think of one.
Mastodon instance for attendees of Refactor Camp, and members of various online/offline groups that have grown out of it. Related local groups with varying levels of activity exist in the Bay Area, New York, Chicago, and Austin.
Kinda/sorta sponsored by the Ribbonfarm Blogamatic Universe.
If you already know a few people in this neck of the woods, try and pick a handle they'll recognize when you sign up. Please note that the registration confirmation email may end up in your spam folder, so check there. It should come from administrator Zach Faddis.