"Each author will be expected to submit a 1-3 word science fiction concept for a card, along with a story that exhibits that idea through character, plot or theme. Please have a clear archetype, setting, or SF subgenre and center your submission around the concept: the focus of the tale should be the idea conveyed, not tarot cards themselves."
It sounds pretty cool, but in case it wasn't clear:
I Think you're supposed to make up your own arcana and write a story around that arcana.
Like, it gives the example of "The Geneticist" on the page, and you CAN use it, but from a strategic perspective, I would not, unless you have an excellent idea for that arcana.