Legendary Healer Item?

[Warlock]

Oh, I know!

Dalaran Sphere of Power: Casts a shield with a 10-yard radius about the caster through which no enemy or enemy spell or attack may enter or exit.  Friendly players may enter or exit the sphere at will but their spells may not enter or exit the sphere either.  The sphere is a channeled spell (meaning the caster can't do anything else) and costs 300 mana each second the sphere is up.  Cooldown: 10 minutes.
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I like this one. Best used while standing next to your MT. See how long it takes him to realise what you just did :)