This is a build I devised recently that works very well, especially for this weekends Factions preview event. It's a Me/N that focuses on blinding warriors,rangers, and assasins while shutting down casters. So far it's worked *very* well in the random arenas.
Domination 12+1+1=14
Fast Casting 8
Illusion 10
Signet of Midnight {E}
Plague Touch
Power Spike
Arcane Conundrum
Power Leak
Diversion
Shame
Rez Sig
Since it seems like everyone and their mother is picking assasin builds, I can easily cripple any team by using Midnight Sig and plague touching another warrior/ranger/assasin. Not a new concept, but still effective. I've been noticing that lots of warriors have been using Plague Touch as well, perhaps as a defense against Blind. After I blind, I turn my attention to casters, monk first. The major weakness of this build is it's inability to get rid of enchantments, I'm powerless against IW mesmers. I've been thinking of taking out either power spike or arcane conundrum and replacing either one with Shatter Enchantment.
This build is pretty great though. You will annoy those assasins to no end, but hey...they deserve it. They can tear you apart in a few seconds.
Anti-Everything build...almost
Inspirational Muse