Okay so I want to develop an extremely flexible, lightweight roleplaying game format that can be used to basically provide structure for joint storytelling between players and GM.

I'm thinking 4-6 stats. Something like Talking, Logic, Magic, Athletics, Combat? Every player can allocate numbers 1-5 for their relative strength in the different stats. Then to do things they draw that number of cards from a deck and choose which one to play, and they have to beat either a target draw (drawn by the GM) or an opposed draw (by another player).