This is a very simple ongoing challenge.
The first person will write 1 paragraph of their own story, and make 1 card to go with it. The second person will continue the story with another paragraph and another card, and it keeps going.
In the end, it will make a 264 card set, with 15 basic lands, 101 commons, 80 uncommons, 53 rares, and 15 mythics, consisting of 2 Planeswalker.
This is a very original idea, isnt it?