Perhaps a double strike creature or Instigator Gang?
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I'd consider Ashenmoor Gouger and Hellspark Elemental (however, the latter isn't Lorwym-Shadowmoor)
Maybe take out Mosstodon because, other than itself, you only have 4 creatures with Trample. If you want creatures with 5+ power, go with Emperor Crocodile, Iwamori of the Open Fist or Blastoderm.
What's with the Myr Battlesphere exactly? It is a great card, but doesn't help Helix Pinnacle at all. I'd go with another Galvanizer.
I think you oughta consider more 4-ofs. For this type of deck, Spellbreaker Behemoth and Deus of Calamity are reccomended.
Very nice. I've got an Allies deck as well, though I run a lot more 4-ofs. I use Soul Foundry as opposed to Mimic Vat and I'm planning on Nameless Inversion for removal because it pumps the Allies.
How about Bonesplitter as opposed to Demonic Appetite. I have a similar deck I'm working on.