If you don't have gear to do Fatal XRay at the start of the Match. Use Master of Souls ERMAC, Mournful Katana and another Outworld Character.
Master of Souls ERMAC will start with 3 Bars of Power (2 Bars from Katana and 1 from another Outworld Character)
Put your strongest Tower gear on ERMAC to do the most damage.
Right when the match starts, Do Fatal XRay, Pause the Game really Quick, and Quit. It should take you no more than 15 Attempts.
Prior to this method, I tried everything with zero luck.
