I am using the highest level root I have, wich is Enstill (60 mana). Otherwise, I have the basic root that I got at lvl 14 (40 mana). I'll try it it.
I can also try after the counterspell, but I doubt I will live through, as I am usually pounded on as soon as I cast. "Reflecatble" spells take a lot of time to cast ( not to forget that I weaken myself with a dot, a nuke or something of the kind), then I need to wait for the gems to refresh, and then I would be able to cast root for a try... All of that if I am not interrupted. And all of that at least twice.
Mage thinking

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Sadly, I am a Shm+War combo. No DS, and just a couple of HP buffs ( nothing horrible, but nothing too huge).
Would it be hard to exclude root spells from the code on this?
It wouldn't be overpowered, since you would encounter the risk of having root reflected on you. And beeing rooted is probably one of the worst things for a caster/crowd control...
PS: Syalara posted while I was typing this. Maybe I should try my poison PBOAE to "pop" the reflect slot from my 3 friends.