Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Pros / Cons
After complete build crazy damage
Great turret destroyer
Oracle makes him less intimidating
Some mana issues
Crit Damage on marks,quints and seals.It makes his crit powerfull,it affects his Q and don't worry about armor cause after last wisper you are powerfull even against 200 armor tanks.Plus after IE u have exactly 300% crit dmg.
And some CD on glyphs to have your blink more often.
Ghost. since you will have to chase they carries or escape a gank.
Ignite. mostly for early game to get kills so that you will be at a decent state in late game.
Besides these two:
Exhaust. it works too but besides your blink you don't have a solid escape
Flash. used to use it a lot in the past but it is better for mage shaco.
Materies that are useless:
Smite. you are not a jungler.
Fortify. tanks in your team should get that.
Your role in the team is to stay behind,wait for the carries to show up and kill them before they inflict too much damage to your team.Besides that some organized ganks at early/mid game and you are good to go.
Well,there hasn't been any solid assasin shaco guides recently so this guide pretty much explains how to be an accomplished assasin.
Things to come
Videos on how to perfect your role in team fights.
Videos on how to gank effectively.
Videos on general tips.