5x Resto shaman's, with Magma Totems down.
It has been tried, and in BG's is decent.

Druids don't have anything for passive damage.
Well maybe if you include Thorns.

In 3.3, knock back effects will not dismount you.
Until then, get naked and use flight form.
Typhoon an opposite faction toon.
Works with Blastwave, Thunderstorm etc.