I was running this build last night with great success in RA. Now it is not Uber in any sense, but it is high pace and is a huge pressure on healers. It can take out Warriors as they run to you, and sometime before they can take a swing at you. Elementalist, Necromancers, Sins, and Mesmers without protection will drop very fast. Monks and Ritualists have to switch there healing to themselves leaving all other targets open to your team. Dervs are harder because of there enchantments but if you are tag teaming one with another party member they do feel the heat. Never had the pleasure against a Paragon. And last but not least Rangers seem to always last a long time do to armor, but nonetheless they will feel the pressure. The great thing is you can keep your caster weapons and not have to get in touch range of anything. Conditions/shut down can be a trick, but hopefully you can take down your opponent before he gets a chance to shut you down. If you are in trouble you can copy shadow refuge it will enable you to keep up the healing for a long time. Most will lose interest in you once they notice they can not kill you right away.
How to use this build. Wait a second as the opposing team is selecting targets (That awkward 10-20 seconds or so before they attack) open your attack with conjure nightmare on a warrior derv or caster (If targeting a sin wait till he has started his chain on someone). Use Echo then Dancing Daggers then Dancing Daggers then Entangling Asp then Signet of Toxic then Dancing Daggers then Dancing Daggers (target is usually dead by now but if not continue) then Auspicious then conjure nightmare (yes it is a duplicate but you need energy) then Dancing Daggers then Dancing Daggers. Get the idea?
Mesmer / Assassin
Deadly Arts 12
Illusion (How long you want nightmare to last?)
Inspiration (Your Choice even just a few points will keep you full of energy)
Fast Casting (Left over points it does not need to be to high no long casting spells)
[skill]echo[/skill] [skill]dancing daggers[/skill] [skill]entangling asp[/skill] [skill]conjure nightmare[/skill] [skill]signet of toxic shock[/skill] [skill]Auspicious Incantation[/skill] [skill]shadow refuge[/skill] [skill]resurrection signet[/skill]
Try this out it is pretty fun