Skills
-----
Jagged strike
Wild Strike
Critical Strike
Vipers Defense
Critical Eye
Way of perfection
Shadow refuge (or whatever you want :P)
Res Siggie
Att points
---------
13 in Critical attacks (that way you benefit from the +3 energy per critical)
8-9 in shadow skills (makes way of perfection last longer and do more good)
13-14 In Dagger mastery (sup rune if you can get one :P)
The logic of this is that with 13 in critical and with critical eye up you get just under 20% chance to score a critical (seems to happen a lot more often than that though I'd say). You gain a healthy amount of energy back per critical and with way of perfection up you get some nice health back too.
You cause a conditions from the word go, followed by a great stance remover (love it

When things get hetic, teleport around like a madman using vipers defense to cause widescale poisoising to all.
Refuge I just have in their in case things get sticky, +8 regen isn't to be laughed at even if it only lasts 4 seconds.
Not sure what elite I would use yet as I haven't seen em all but any suggestions (and where to get it) would be useful.
What do you all think?