I'm not a shaman player but it seems to me that the decks that can afford to run 1 or 2 Lightning Storms would rather run that. And the decks that can afford to run more than Lightning Storm would rather run Elemental Destruction. Not sure that there's room for this one.
If you run 2 of these aswell as 2x Lightning Storm you pretty much win every game against Zoo, so i guess that's what they were aiming for. That's the only use i see for this card. If you really hate Zoo it's good i guess.
With blizz seeming to push some sort of spell damage Shaman this release...could be easily a 2 mana 3 damage everything summon a random 1 cost minion...and no overload. Easily a 2 mana 2 damage AoE with just the Spell Damage totem.
Purely for control shaman or spell damage deck. It's easy to buff spell damage in shaman so... many times a 2 mana consecrate with an extra trash minion. I think it's better than fan of knives. Loving the no overload.