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The problem is, you can back up the Painterstone finish with Chant / Abeyance in the Control Mirror. They will have to counter every single Chant and Abeyance or lose instantly. So they will run...

Doll can be pretty solid, even though it is expansive and loses against Swords. But you are overvaluing Guilty Conscience. It is not only "not fantastic", it just sucks as much as a card can suck.
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How about Oblivion Ring? Nvm. you are running it already. And Runed Halo? Hmm, you run that, too. So maybe you don't need another tutorable spot removal, especially because Halo and O Ring seem way...

The scepter lock can create wins out of nowhere against decks like Survival, Loam, Rock or Ichorid, all matchups which are autolosses without it. It also wins G1 against Goblins, Faerie Stompy and...

I didn't mention any synergy of Grun with Snow.

You may want Jotun Grunt in the Valkyre slot. Valkyre is a strong finisher and has snow synergy while Grunt is a solid creature and his ability can work like Gaea's Blessing in Helldozerdeck or...