I was considering that aswell although if the Instigator Gang is allowed to transform they will deal a lot of damage with that battle-cry effect and I was also considering the Mortars and Thundermaw Hellkites, my only concern with the Hellkites was the dubble-red mana since I only got one mountain that I can ramp up at the moment however I should perhaps consider to put both Thundermaw Hellkite and Mortars in the sideboard and give them a shot :)
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I like this deck :) Seems to be a rather fun concept to win and also be very good at locking your opponent up. Something that perhaps could be usefull or fun to use could be Trading Post to create even more goats but that might not be as mana efficient though. Anyways looks like a really fun deck to play with :)