So I have submitted a variant of this bug previously which got declined without a reason.
Lavamancer Erupt combined with a hero switch, or multiple hero switch's can result in some insane DPS on Defenses. Basically adding as many buff multipliers appears to just scale out of control. However, an additional bug is being able to keep this buffed damage for infinitely.
Please let us know you are aware of this issue, so we don't keep reporting the same bug over and over. As a handful of us have reported this bug with it simply being rejected. which implies you guys don't believe its a bug.
here is a video of the results: