You may wish to consider Strionic Resonator as it combos with your commander well, allowing you to get back two goblins each turn. Also, you possess many other creatures like Cabal Slaver, Goblin Matron and Sensation Gorger to name a few who can make use of this and its mana cost is pretty low as a bonus. I see you have Slate of Ancestry in your maybe board, from my experiance in running aggressive goblin tribal its pretty good and with Wort, Boggart Auntie you lose very little from discarding. Possibility Storm may also be fun to add some fun chaos to the game and disrupt control players as well, if you want to be mean you could also try Painful Quandary.

Thanks! I just found a Strionic Resonator in the bargain bin last month

I have always had a soft spot for Dragon Throne of Tarkir, and it's making the cut for my own Wort deck. I don't know how often you swing with your commander, but worst case it is a 6 mana colorless Overrun.