The question you should really be asking is not "what class?" but "how?" Figure out what method is more efficient for you, and from there you can figure out what is the best class to do it.
At level 9 you get Word of Pain, your first PBAE. What you should be doing is having someone pull a bunch of mobs, DS themselves (either via a normal spell or with a potion), and then you cast the AE once before everything dies and get full exp. Druid is the obvious choice, and is fine below 30 or so, but can't tank a lot of higher-level mobs as well. Shaman or Cleric might be better for high levels. Bard could work, too, but would probably be AE snaring the mobs while you nuked them all down - no DS needed.
There's bound to be other methods I'm not familiar with; this is just off the top of my head.
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