Burn at the Stake would rock in a straight goblin deck, but I don't know how useful it would be here. Ideally the goblins will serve one of two purposes, either a) they help you overrun the enemy or b) they're just a TON of chump blockers. The real offense here would come via the drakes from Talrand, as a flock of 2/2 flyers can get nasty pretty quickly.
A few quick thoughts.
First, Chandra, the Firebrand would be perfect with Talrand, while also giving you some added punch here. To be honest, I'd make her the top of the mana curve.
Second, I know the four spot is already pretty full, but Talrand's Invocation would work wonders too. Even 2x of them, with Talrand out, that's four for three 2/2 flyers. Much less if you use Chandra to copy it, then you're looking at six drakes in one turn for only four mana.
Third, I can see where the Goblin Chieftains fit for the time being, but I'd actually likely drop 1-2 of them for Arms Dealer as those won't definitely help your attack as much, but they are more versatile in terms of clearing the way for your flyers.
Fourth, I'd also exchange Mental Misstep for Vapor Snag or Unsummon. Perhaps even something like Claustrophobia could make its way in here, as they might as well be full blown removal spells.
Fifth, I'm still on board with Favorable Winds or until rotation Adaptive Automaton - some means to pump all the drakes to help make them more dangerous (if only you could find a way to work in a touch of white for Intangible Virtue). The chieftains do that to some degree, but I like to think of the goblins as being expendible more so than the drakes - Goblin Grenades?
Lastly, god I can't believe I'm saying this, but I can see where Snapcasters or some other spell retrieval would be ideal here. The last thing you want is to run out of spells. Archaeomancer is the obvious choice, but that's just further crowding the four spot. Perhaps some sort of draw mechanic and Elixir of Immortality?