I also don't see the point of Coralhelm commander in the deck :/
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as i see it, you have no good way to deal with pesky planeswalkers or artifacts like Mimic Vat or Liliana. Consider using Into the Roil. I've found that it works really well due to the lack of permanent removal in standard ^^
Your dudes cost too much mana. You have no acceleration. You have no way to get vengevine out of the graveyard until late game.
I would consider taking out the bringer of the white dawn, he seems rather out of place here.