Im playing shaco since season one. He is my main champion too.
This build is trying to show that shaco is not useless in late game.
Ok so lets start!

"OMG this noob why no jungle item?"
Jungle item is not worth on shaco. its not bad but rushing a hydra is better in ganking and 1v1ing the enemy jungler. (Wriggles was good before they nerfed Feral Flare)
Hydra Last Whisper Botrk are items to burst... Allways buy 'em
After these choose a tanky item then Bt/Infinity.

Smite and Ignite: Ignite is very usefull when you gank and also in bursting down someone in late game.

Smite and Exhaust: Its good sometimes vs jax / yasuo / jinx but ignite is better with this build.

Smite and Flash: Huh, Its so bad. Maybe on ap mid.

There are two starts for this champion :
Start 1: Hunters Machete + 4 pots
Go the blue place the first box at 0:57, place more 3 until 1:55.{DONT SMITE BLUE} So after you got the blue go that new season 4 camp smite it.{Allways let the box tank} After it go the wolves then wraiths then get red buff (with smite) after this you go to the golems. After the golemns your gonna be lvl 4, go back buy a pickaxe with a pot. Start to gank.

Start 2 (I prefer this): Blue -> Wolves -> Red -> Gank

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You can get dragon at level 6 with your ult!

This is the part of the game where almost every shaco player fails!
Go in first with your Q sneak on their carry then AA-Hydra-Ult-Botrk-AA-E-Ignite/AA
Their carry is dead now you start to fight with others or jump out if your healt is low.
If their carry is dead they cant really win the fight!

I hope you like this build!
If you got anything to say just leave a comment :)

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BUILD IS NOT DONE! I WILL UPDATE IT WITH HOW TO GANK WHERE TO GANK ETC...
JUNGLING IS GOING TO GET AN UPDATE SOON!