Help with Berserker Myth Buff

[Zgragnok]

Just got the Zerker Myth and it is a toggle type buff that drops every time I zone. I've tried to several things to get this working but so far no luck. I can't get it to rebuff without it turning off and on, so I have to manually click it if I can remember LoL. (TLE server FYI.) Anyone have an idea how to set this to turn on after zoning to a new zone?