As a priest and avid mana consumer I know the feeling of being OOM, its horrible and I lack in battles. However, I, as well as other mana enthusiast, am fortunate to have multiple ways of obtaining more, whether it is from my Shadowfiend, Super Mana Potions, Conjured Manna Biscuits, an Innervate or Purified Draenic Water.
As a Chieftain of Tribe, I invite you to help out other tribes of other dimensions who are not as fortunate as us in the ability to regain a full mana pool.