Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Well, recently I have come across a new possibility as to how to play Shaco. It's probably done before, as no idea is completely original. It is heavily based off of his lovely Two-Shiv skill, as it has a 1:1 AP ratio as well as a 1:2 AD ratio. It is perfect for early game harassment as well as chasing down fleeing opponents late game. The debuff on basic attacks is just a bonus.
You may question placement of masteries into the defense tree, but let's face it; Shaco is fragile.
Also, feel free to switch out Malady for Nashor's Tooth at any given point. Malady is simply a wonderful first item purchase, but the increase on AP, attack speed and the cooldown reduction of Nashor's Tooth is not to be passed up.
This isn't going to be a fancy guide on how I think you should play Shaco and what's best. I just want to get an opinion on whether you'll think this 'hybrid' Shaco will work.