Most would say that death isn't funny. It isn't, unless you're Shaco - then it's hysterical. He is Valoran's first fully functioning homicidal comic; he jests until someone dies, and then he laughs. The figure that has come to be known as the Demon Jester is an enigma. No one fully agrees from whence he came, and Shaco never offers any details on his own. A popular belief is that Shaco is not of Runeterra - that he is a thing summoned from a dark and twisted world. Still others believe that he is the demonic manifestation of humanity's dark urges and therefore cannot be reasoned with. The most plausible belief is that Shaco is an assassin for hire, left to his own lunatic devices until his services are needed. Shaco certainly has proven himself to be a cunning individual, evading authorities at every turn who might seek him for questioning for some horrendous, law-breaking atrocity. While such scuttlebutt might reassure the native inhabitants of Valoran, it seems unimaginable that such a malfeasant figure is allowed to remain at large.

Whatever the truth of his history might be, Shaco has joined the League of Legends for reasons only he knows. He is a terrifying figure, typically shunned by both his fellow champions and the media at large. Only the summoners in the Institute of War know why such a creature was allowed into the League, but most Runeterrans suspect it to be a means that allows the power that be to keep an eye on the ever-elusive Shaco. Unsurprisingly, this champion is popular in places where madness can openly reign, such as among the power-hungry summoners of Zaun and Noxus.

Whatever you do, don't tell him you missed the punch line.

in this build u may feel hard to farm if u dun have a blue buff,so u should get it wif ur (4-5 boxes) in case that ur team dun have a jungler.
plz remember that ur aim is to kill champion,u can just last hit to farm. SAVE UR MANA.
u can use ur to harass ur enemies when it is in 2-3 rank .
in this build u should use to hit one of them and quit immediately .if ur enemies didnt have much hp, u should get a kill.
recall back anytime when u have enough gold to buy a Sheen ,ususlly 4-5lv
then u will deal haevy early dmg wif ur Deceive.FOCUSS THE SQUISHY ONE.
u can gank often when u have
u can change it to mecury treads if they have much cc
PLZ REMEMBER THAT U ARE AN ASSASIN ,UR JOB IS TO KILL ,KILL ,AND KILL .
u shouldnt be the first one who enter the team fight ,u can send ur clone in first ,and harass enemies wif 2-shiv and JiTB,use ur Deceive to chase or bd the carry .
ur best partner in a lane will be champion who can deal also heavy dmg like Xin Zhao and Olaf or support like Soraka .
wif ur ad ,ur clone can deal much dmg try to use it to kill someone or push some turrets .
ur clone can also help u to own a tower diver .
there r tons of skill when using shaco, u can learn them by reading other guides of shaco XD

U can change Guardian Angel to Madred's Bloodrazor or an additional Bloodthirster
for more damage
If ur enemies stack armor ,u can build some armor pen...
Banshee's Veil and Guardian Angel can be changed into some ad items ,if u want .

my runes set boost a lot in critical demage .therefore , my can deal much heavier damage to enemies .

Mastery

i put 21/9/0 because i find the magic resistance and armor very useful ,especially early game
they can either save your life or help u win in a 1v1 battle at the beginning .

core build is Rabadon's Deathcap , Lich Bane .Others r optional .
if they stack magic resistance ,u can build a Void Staff .
If u want more cdr , Morello's Evil Tome will satisfy ur want ,also u can take Ionian Boots of Lucidity instead of Sorcerer's Shoes .But actually u should get a blue buff .
if u want ur boxes to deal more damage and some extra hp , Rylai's Crystal Scepter will be good for u .
If u need spell vamp ,u can take a Will of the Ancients or Hextech Gunblade .
i prefer Hextech Gunblade coz its ad and active .
U may want a blue buff all the time for extra cdr .Also ,elixir of brilliance may help u too .i take cleanse and flash as my summoner apell for survivalbility .
But other summoner spell like Exhaust , Ignite , Teleport , Heal or even cv is good too ,depends on ur style .
If u take exhaust or ignite etc u may put 1 point on Summoner's Wrath .

U guys may think that it is just trolling ,but it is viable . make your clone do only 75% damage(50% to turret) and take 150% damage .However ,your attack speed won't be affected .The damage from on hit item won't be affected either .Therefore ,this build will let your clone deal same damage as u do .
Banshee's Veil and Guardian Angel will help u survive .As a dps ,u should stay alive to deal as much damage as possible .Your clone can use items too .It can also survive because of the passive of Banshee's Veil , Guardian Angel and Wit's End .
Also i take Ghost and Exhaust to chase enemies more easily .
U can change Berserker's Greaves to Sorcerer's Shoes or Mercury's Treads

Situation items

Malady and Sorcerer's Shoes can be used to encounter magic resist .
u can replace Banshee's Veil or Guardian Angel by Malady if u want to deal more damage .
Also ,if ur enemies deal more physical damage then magic damage u can use Thornmail ,which is a good item that ur clone and urself can both return damage .Ur clone can even return 150% coz it recieve 150% damage .

u can put 3 jack in the boxe at the back of the ancient golem and 2 at the red buff .
then u should ask ur teamates to attack the blue golem and trigger jack in the boxe . u go to the red buff and u can get both red and blue buff at the very beginning .as following
http://www.youtube.com/watch?v=IXyTe-GVAfA&feature=related


u can change to
i can't determine which is better but i love the movement speed and the slow of .But the red light in ur hand may be deadly to u lol .

If u want more suvivability u should take and as ur summoner spell
Double flash is always good . At this situation u should change to in mastery .

the jungler shaco may not be good . it's because i am bad at jungling lol(jungling require more experience and skill)
u may take Madred's Bloodrazor instead of Guardian Angel if u want more dmg
however ,i wont recommend u guys to do so...
also ,u can read other guide for the jungling skill and route ...

*I found that shaco can still jungle well without Smite ,coz the jungle is nerfed . u can change it to Flash , Ignite etc

some may think that i should not maximize ulti first .however ,imo ,if the clone can deal more magic demage when it explodes ,the team fight will be helped a lot. its because it deals AOE damage to enemies .

Enemies may buy Vision Ward or Oracle's Elixir to stop ur killing spree , if they do so ,u just play in a defensive way .Don't chase enemy urself , unless his or her teamates r all dead ,u r chasing for an ace .
Other skills like 1. using ulti to dodge the ulti of Karthus , Ignite ,etc
2. using ulti when u are enemy under enemies' turret(s) and force the turret(s) to attack ur clone
3.Using ur clone to check the brushes
4.using as ward. Coz the nerf of his box, now his box can only last 60s instead of 90s. I recommend u not to waste ur box. U should only ward IMPORTANT place when NECESSARY.(Damn! What a big nerf!!!!!)(Greatly affected his ap build. )He no longer dominates dominion. Also no more boxes trap.
6.press alt + right click to control ur clone
7.after using ulti , force ur clone to move first
8. at opposite direction
9.etc.. U can find those in other guides too .

Occupy the brushes

. u dun need to put too many (1-2) in the brushes .Ur opponents won't go into the brushes if they r not idiots .If they go in ,u can choose to run away or kill them ,coz they will be feared(disabled) .U will have enough time to run away evebn u don't have .
Occupying brushes will give u tons of advantages .
1.U can keep urself or even ur partner safe .Ur opponents ,especially when 1 of them or both r assasins ,which deal heavy damage but squishy .They usually have to stay at brushes and then burst such as Xin Zhao , Poppy .
2.U can prevent Garen from staying in brushes lol .(Also Janna , Blitzcrank ,they r annoying lol]]
3.U can come out and last hit then go back to the brushes or harass ur opponents wif ,ur enemies won't chase u .
4.U can use ur and secretly .Ur allies can also Teleport secretly to gank .
5.Will be added...

I found that not only basic attack can trigger Backstab
Two-Shiv Poison , Deathfire Grasp and Hextech Gunblade can trigger Backstab too .
Hope this will help u guys .
And plz give some comments and up vote my build to let more people read this guide , thnx very much .

i feel sry about that my english isnt good ,hope u guys wont find it difficult to read my guide .

This guide will be updated after every new patches

If you have other suggestions please tell me, I would like to improve my guide as much as possible.