I've played the deck with Chasm Guide and it seemed to have too much of an impact on the curve. With Bushwhacker you can play an Envoy, Healer, Whirl Blade, or even a Patrol or Scout and then the goblin for 2 and give thing aggro then. The goblin also gives a pump along with haste. Also if you manage to do a march from the tomb with 7 mana on board, not only will you get a huge trigger with the healers, but then you can play the goblin for two and give all those guys haste. plus if i come down to it, titans strength can work to make the goblin cheaper.
I see your point it's much cheaper because of it's surge ability. And all your creatures get +1/+0. I'll add it to my deck.
About what you wrote about my deck. I was thinking about replacing some of them to lower the mana curve and make the deck more aggro.
Kalastria Healer has a good effect but I couldn't see any synenergies with the other creatures as I want to attack in every turn... But I could retrieve it with
March from the Tomb. Let me think about it.
Roil's Retribution was just something to try out, I would replace it with Runious Path.