The Mistborn Adventure Game, seems like a very flexible system for using to roleplay certain fictional worlds. I really like it.
I am wondering if it is based on any other system. Perhaps FantasyCraft, by the same publisher?
It seems similar in many ways to the One Roll Engine. Similar dice roll mechanic, but swap the d10s for d6s and swap width for Nudges (6es). Similar initiative/turn order system too. However other things, such as its particular take on narrative storytelling. and its notions of distance, and props, and breathers seems different.
Is is based on something? Have the Authors come out and said: "We were inspired by A,and B from One Roll Engine and by C from Z system?"
I have been messing with a few total conversions of the Mistborn adventure game, to tell other stories (StormLight Archieve, Brent Weeks Lightbrinker series, Jim Butcher's Codex Alera). However if it is itself a conversion of something more generic, that might be a better starting point.