A couple of recommendations, as I run a similar goblins deck, myself. First, if you can find some copies, grab
Impact Tremors. It pairs really well with
Krenko, Mob Boss. Second, if you do put
Impact Tremors in the deck, I suggest then swapping out
Krenko's Command for
Mogg War Marshal, as you're still paying 2 mana for 2 1/1 bodies, but ignoring MWM's Echo cost on his second turn in play means he dies, but he immediately replaces himself with another 1/1 token, so you still have the same number of creatures in play, but
Impact Tremors gets triggered again. Just some food for thought.