Just found this out today (stopped queuing 2 months ago). S8 Best Season ever.
Brain Eater - NPC - World of Warcraft
NPC "Brain Eater" in Duskwood applies a 10 minute debuff called "Plague Mind", persists into rated arena.
Plague Mind Disease
10 mana leeched every 10 sec.
10 minutes remaining
Breaks any CC that breaks on damage when the mana drain ticks (Sheep/Blind/Repentance/Scatter).
GL pushing for glad.
-Vibrate @ Kalecgos