steady breath on +atk/-def kana?

Female Kana is a very good option. She's the fastest green dragon so can work very well on player phase which is where dragons are usually weakest with dazzling staffs, firesweep and Bold Fighter posing problems.

Mine below is +Def -HP and works very well. Her defense will suffer with your bane but as she'll only be hit once it doesn't matter too much. Swift Sparrow can replaced with Fury as a budget option. If you want a Steady Breath green dragon, Fae really needs it.