Alrighty Folks, this will be the first build that I'll be creating on this site.

Let's start with the Pro's and Cons for this build.
Pros:
- Amazing attack speed which transfers to your Clone
- Decent damage
- Great ganker.
- Can solo Nashor if you go with the right items.
- Can face roll tanks with the correct items.

Cons:
- Squishy
- Item dependent
- Expensive

Items:
Start with a Long sword and a simple HP potion, the long sword will give you the attack you need in order to take out golem early. (More on that later)
Save up for Berserker's Greaves, this will give you vital movement speed and attack speed that will help you start out with your ganking.
After getting your greaves, try to get a Sword of the Occult as soon as you can, it snowballs and winds up giving you a nice movement speed at 20 stacks. (It'll help you move from lane to lane to gank easier.)
Now you've got an option, look at the other team, if they've got tanks, I'd suggest getting the Madred's Bloodrazor next as it will help you take out their hp quickly. If there aren't any tanks, save up for a Phantom Dancer. The critical Chance, Movement speed, and attack speed make you a beast.
After getting one of them, I usually grab the other, as they compliment themselves well.
If you happen to be the only DPS, grab a Stark's Fevor for the life-steal and extra attack speed.
If the game hasn't ended yet, I'd grab a Sword of the Divine to get up to the 2.4 attack speed.

Early Game:
Early game, play quite defensively, if you've got a good Damage Dealer on your team, you might want to try to grab first blood, but focus mainly on last hitting creeps. Last hitting creeps is your main Focus as Shaco, until approximately level 7. Usually at level 7 I go out jungling to grab some buffs.

Mid Game:
Alright, so this is where you want to go ganking. You should be around level 8 and you want to get some stacks on your Occult.
This is your time to shine, look around the map to see who needs the help, or if you see someone that you could easily gank with a teammate in lane.
Keep ganking until your team has a comfortable push in a lane.

Late Game:
If you have all your items, it's time to end the game, fast.
Go get baron with your team, or by yourself.
EDIT!: I don't know if you can still solo Baron after the nerf where your clone doesn't have items.
Push lanes down fast using your team as a distraction.
Make one final push and end the game.

Congratulations, you should have just beaten the game.