Works awesome with Chandra's Spitfire, since it will get +3/+0 for each attacking creature with a +1/+1 counter on it.

And although that one's not a Shaman, it is an Elemental.
So you can even tutor either Chandra's Spitfire or Rage Forger it with Flamekin Harbinger.

I smell some scorching potential for an Elemental Shaman tribal deck here...