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In theory, healers could use spell haste rating to maximize downranking. More haste = faster big heals. But, unless items start popping up with an interesting blend of +healing, mana/5 and spell haste, I am not sure it would be worth it.
Of course, the value is completely dependant on your class and heal speed.
Spell haste + spellsurge could end up becoming a nifty combo.
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