This is a hybrid/stealth build combining, and relying on a combination of teleportation and sword powers


Attack:

The idea behind this build is using the stealth Shadowmeld provides for the confirmed crits from Element of Suprise, and increased crit and brute damage already a part of the flourish powers. 

The only rule to the rotation is to bamf before hitting with your sword powers. Together, I've been able to deal around 9 million damage within the longest - 8-second cooldown - of his powers, without the best rolls. 

  + ,      +  ,     + ,  +   is the best order timing wise
 Should be used to help crowd control   works great for crowd control with elites


Gear:

Gear should prioritise Crit damage, and Brutal strike rating. He doesn't need to worry about adding crit rating or spirit.

His own uniques go really well with this build, and are what I use. 
Unstoppable force is better than Power Doop in my testing, Midtown Guardian Signet is a must too.
I prefer Excalibur for survivability, but Axe would work too.

There is no great insignia for Nightcrawler, Mockingbird, Black Widow, and Cyclops work

Infinity:


First 50 points should go into Mind gem for critical damage and the healing bonus

Next reach 150 points in time gem, 25 levels in the attack speed node, then reduce the dash cooldown (I find at 2s cooldown for bamf you stop worrying about charges in a fight)

From there, it's more about preference.
Offensively, more crit damage or attack speed doesn't hurt, same with brute damage and sig damage.
Defensively, defensively, health-per-second is best with stealth characters, dodge isn't bad but you should already have 150 points in Time Gem when you're considering it.