Shamans are all about efficiency. At low levels, most buffs (and debuffs) aren't worth the mana cost. You're better off healing in a group, or dumping any extra mana into your weak nukes and dots (if the mob lasts long enough for a dot to matter).
On that topic, I didn't notice anyone mention Inner Fire. It's a weak buff, but it also heals your target every time you cast it. It's a more efficient heal than any of your "real" healing spells until level 19, and it's relatively OP in the earliest levels.
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