With Sub Zero near the corner:
AA freeze, air-to-air punch, air-to-air punch, d1, d1~X-ray...I'm pretty sure that's how the combo goes. It does about 15%
This one that @EddyWang does with skarlet at 2:30 in the video takes the cake. Total damage is 36 with an X-ray but the glory is that she does blood ball damage on herself too!!! I love it