I always love a good Breathless game, and seeing a magic system written into one was a (dare I say) Breath of fresh air! It allows for players to have something more to them and the ones written for the stunts matched well with the narrative and allowed for further story telling. The Magical Items table has fun and unique items on it that also allow for narrative push and it's very clear how each is used in the game and how often it can be used. 
The Sample Story was very helpful! I don't know know anything about Mistmarsh so I was a little lost on how the narrative and story went, but after reading the Sample, I feel more prepared to create a story and game using this for my players. 

Overall, excellent Breathless game and I'm excited to be able to play it with a group!