Dopple fires blindly into your hexes... so a few things that are nice:
Backfire (put it on him first!)
Power Spike (risky to bring sometimes, but stop his backfire with this)
Empathy (attacking shall bring pain!)
Wastrel's (not for the damage, but for the backfire damage when he casts it)
Distortion (take off wastrels, dodge arrows!)
Shatter hex (you'll probably end up with empathy, smash it in his face)
Mesmer primary is simple, you don't need to resort to running with empathy or any other 'tricks'. Just set up a balanced anti-caster build and bring it down!
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