I think two Sarkhan Vol would round out this deck nicely.
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I like it, it looks a lot like one of the various versions my Goblin deck has gone through. The only think I think you need are more ways to destroy goblins on your own. There are a lot of cards that let you deal direct damage, theoretically you wouldn't even need to attack. Also, the goblins are so low cost, you really don't even need Goblin Warchief or Frogtosser Banneret. I'd recommed Goblin Razerunners, Ib Halfheart, Goblin Tactician or Patron of the Akki. Since it's all Goblin, I'd recommend Door of Destinies or Coat of Arms. Also, Squee, Goblin Nabob and Murderous Redcap are the two best Goblins out there, no deck is complete without them. There seem to be two ways for this to go: Beefy Goblins or Goblin Suicide Bombers. Pick which one you want to do, then emphasize that. I went Suicide Bombers, and I can have ten goblins out at any given time and never have to deal combat damage to win.