I've heard a Pyro Rig (unlocked by reputation with the Protectorate) should be great against the Purger. Didn't unlock it yet, but since Fortifier is pretty much the best card against it, and pyro rig is a lot like fortifier, that should be true. Actually, a Yurich deck with Havoc, Omega, Fortifier (even though its not a raider), Bolide Walkers and Pyro Rigs (and maybe a cannon walker for more siege) should do great against that raid. Another possible commander would be Dalia (or Dracorex), to counter the Flurry cards.