This is a late game build, very good at assassinating, not that good in team fights but its a good way to trick your opponents.
If you are 1v1 with a tough champion this build will help u a lot, because of guardian angel opponents might mistake you with your clone, thus giving u a "DUO Clone".
Be aggressive,but do not over extend,

I take Deceive first because its a good dmg dealing ability that works very well with my runes,
and it is a great escaping tool,
This build uses JITB vary rare as u will not need it except when Deceive is on cool-down for some cc that will help you escape.
Always leave your E for chasing enemies because you will hit pretty hard without spamming skills.
Always take Flash and Exhaust.
Flash works good for escaping but works better with Deceive.
Exhaust is the best disabling skill for AD Champions.

With this build u need to farm and gank a lot as it is an expensive build. Early game shaco needs Blue buff so he can stay longer in lane after Zeal u can easily jungle and farm. Always be prepared to Gank as an assasin this is his way of making money and with runes Shaco packs up quite a dmg early on.