Ok, so I thought I would never get this but i managed after about 3 hours grinding on the mobile app. I saw this tip somewhere else so I figured I would pass it along for anyone trying for it. The easiest way to do this is to go to the Faction Wars section on the app and do the quick battle; it counts as a ladder. Apparently though, I was going about it all wrong. I was using my best cards and only one was gold (Kano). Since people have found the glitch/hack for infinite souls and coins their levels are extremely high and thats who you face usually when you use your good/gold cards going into the battle. Instead, use low level bronze cards and you will face opponents of almost equal difficulty.
Even if they were higher levels I still won majority of the battles having lost about 15 total matches. Has anyone else had luck unlocking this?