The main goal is to expand on the use of flying weapon, particularly under the air element.
I was debating making it a shield, but I kind of like the idea of having it stack. Its supposed to represent the player mastering a mystical artform that enhances their weapons.
As a shield card it would need to be modified a good deal, but if people think it should be made a shield it could certainly work out that way too.
It would be a different thematic feel, but the end effect would be pretty similar.