Yeah, my strat now is to focus their Mage and force an Iceblock and then swap back as soon as it wears off. A Mage left alone is just going to turret cast you to death. If they didn't have Iceblock I think it'd be a different world for us--You lose so much momentum when you have to swap targets and then back. This is, to me, almost a good enough reason to run with a Shaman healer. You get the offensive Purge so you can rip off Iceblock and get the Mage kill asap plus they're pretty durable.