Shutdown Air Mage

Air Magic 12+3+1
Earth Magic 8+1
Energy Storage 10+1

Glyph of Elemental Power
Thunderclap {elite}
Iron Mist
Lightning Strike
Glyph of Lesser Energy
Lightning Orb
Air Attunement
Rez Sig

Obviously, set up Air Attunement pre-battle. Then, go down your skill bar on a called foe (make sure you call your target because Iron Mist means your the only one that can damage them). With elemental power, Thunderclap costs 5 energy each time they're hit by your attacks. That means Lightning Strike costs 10 energy and knocks down, and Lightning orb costs 20 energy and knocks down. If you ask me, that's one of the best deals in the game. Plus, iron mist will make them move 90% slower. Thunderclap is continuous since it should last over 20 seconds, with a 15 sec recharge time. So far in pvp I have found this build to work very well, but haven't played it that much... I'm just looking for some critiques please... thanks in advance for the help.

Arent you getting useless after Thunderclap? It will drain your energy to 0. If it's for the constant KD, take a short bow with you, it have just the right speed to keep them knocked down everytime.

He is an Elementalist,not a ranger

It wouldn't matter. Any Lightning damage would knock the Thunderclapped target down. Just slap a Shocking Bowstring onto a bow and you've got free knockdowns.

Doesn't even hitting it with a Staff that does Lightning Damage (Air Staff/Rod) knock them down as well..?

Probably a Short Bow with a Shocking Bowstring or something if you want a more rapid and faster attacking I guess...