I've run Nightsisters long time in arena myself. Go for spirit. With equal modquality 100% win against: bastila, jtr, cls, bossk. Capable to beat jkr. No chance against palp, traya and dr. But agains… (View Post)
I agree, that CLS is difficult against good revans. ZFinn and Nightsisters are solid reliable counters. Using Nightsisters myself in arena and able to beat all revans. (View Post)