Side A
Increase your primary attack value by 1 and decrease your auxiliary attack value by 1.
Side B
Increase your auxiliary attack value by 1 and decrease your primary attack value by 1.
I'm thinking you have to choose a side at the start of the game like with adaptability. Being able to switch back and forth during the game might be too powerful and if it was done that way would require a higher cost so might not get used.
Probably a title or mod so all can take it. More likely a generic title since the unique titles suck. Not sure about cost...maybe free?
Thoughts?