How about switching to Elementalis and trying to take advantage of Bloodthisty? It workd quited well in DP and Harbinger is a better 2 drop to go along Karash than what was previsouly available.
Since you want to play Morphic Armor anyways, your Hero ability doesn't matter much.
7 or 8 Harbinger/Ironhide Karash would give you a great chance of having a survivable T2 drop. Going second, T3 Bloodthirsty kills any 4HP allies. Going first, you get a chance to play a drop which is even better.
I think I'd also play a few Rampant Krygon or DMT to combo with buffed Harbinger/Karash to get board control on T3.
So I think that if I wanted to keep the heart of your deck but give it more early game, I'd play something like this:
x1 Elementalis
Allies
x3 Harbinger of the Lost
x4 Ironhide Karash
x3 Spitfire Hound
x4 Cleric of the Asyn
x3 Rampant Krygon
x3 Ravager Zealot
x4 Xar Modulator
x4 Falseblood Cultist
Abilities
x4 Bloodthirsty
x4 Exaltation
Items
x3 Morphic Armor
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