Shammies have Fire Nova or Flame Nova.
Whatever it is called, it used to be the Fire Nova spell.
The name is similar.
It is a PBAoE effect, centered on any Fire Totem you have out.
Magma Totem is AoE damage, but glyphed Fire Elementals are every 5 mins, so I use at least two on every boss (usually keep one Totem of Wrath out, for the team).

On my Pally, Shammy x3, Warlock team.
I have Consecrate, Flame Nova and Shadowfury on the same key.

On my mixed team (Druid, Priest, Mage, Shammy x2)...
I have Flame Nova on the same key as Priest Holy Nova (Priest has Holy Nova on its own key too).
The mage has a [nochanneling] Blizzard macro, so I can spam the key and not interrupt her casting.
The druid has [stance:1] Swipe; [stance:5,nochanneling] Hurricane (pretty sure 5 = boomkin).
The druid runs as both boomkin (spec 1) and feral (spec 2).

If you don't want to broadcast mouse clicks..
The mage could Arcane Explosion for decent damage.