This deck is tight!
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Problem with this deck is that after you devour all your goblins with the Voracious Dragon it's just going to get hit with removal and you're going to be at a hell of a disadvantage. Also, needs more Goblins Assualt, three to be exact.
This deck is all over the place, too large, you need to focus on the most needed cards to support devour. Any amount of cards over sixty is only going to hurt you.
http://www.mtgvault.com/ViewDeck.aspx?DeckID=14964 For review, might help you get ideas, or if you think you might want to try standard.