CONS
Assasin
Great pusher
Insane damage both early and late game
Can stealth to gank and escape
Farms like a crazy
Tanks aren't a problem
CONS
Squishy
Can be hit while stealthed (ex. Mundo's cleaver)
Low mana pool

EARLY GAME
-massive damage towards champions
-decive lets you push and avod ganks
-many players weary around shaco

MID GAME
-lane with tank or support
-try to stay in brush to cause a sense of fear or hesitation
-effectivly use shivs to slow and decive to gank and or retreat

LATE GAME
-Deal massive damage to all characters
-take out tanks, turrets and inhibitors quick
-deciding factor in late game pushes
- **can decive through wall to reach nexus**

IGNITE
ignite is a very usefull spell, ignite can be used directally after a decive and shiv to ensure kill.

FLASH
very helpfull spell, can be used to avoid ganks or to catch up to that stubborn champion!

this build is very expensive, to make up for that you need to farm and last hit as many minions as possible... the more you get into that habbit the faster you can compleate your build with any champion. attack damage with a high attack speed makes shaco a very effective farmer throughout the match.

shaco has a couple very good skill sequences..

ONE
decive in > Shiv to slow > ignite > shiv

TWO
decive in > SPLIT INTO TWO > Shiv > ignite > shiv

placing a jack in the box just after decive may also work..

SHACO is a huge threat and can take almost any champ in a 1v1 or even a 2v(in opposite teams favor) just keep in mind that with out effective use of your already low mana and a skilled combo of abilitys shaco is just another obstical...