Signal pest and contested war zone would really help the amount of damage you give. Also, you might not want to run 4x goblin chieftain, because you are just flinging your goblins at your opponent. Try -2 cheiftain and +2 goblin guide.
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I also used to run teetering peeks, but is was costly to miss mana like that. For one maountain, I would much rather play a Signal Pest, because it would be better in the long run.
I signed up just to like and say how awesome this deck is! Keep up the great work!