Umm, Warlord Kalithresh if you ignore this tanks will tend to kill ya even in T4/Badge gear, this guy if you ignore the crystals (and he tends to get to 60-70% anyway by the time people swap targets and kill it) gives you back mana which you run out of otherwise as he hits like a puppy.
Ignore crystals because he hits like a puppy, if you don't basically the only mana you will get back is the bar you started with so your threat is heavily capped

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Ahh, but you have heard of me.
http://eu.wowarmory.com/character-sheet.xml?r=Lightbringer&n=elyria