Legacy Item Working In PVP Brawl, Doing Millions Of Damage (Patreon)

There are credible reports of people using the legendary cloak(s) from Mists Of Pandaria in the PVP brawl: Southshore vs Tarren Mill. The cloak buffs are proccing and creating massively overpowered damage. 

I tested some other items from MOP and it seems only the legendaries or some other rare exclusive subset are operational. The legendary ring from WOD does not work for me.