Hi! My name is Luki bre, and i've been playing Shaco in the mid lane for a longer time. The main reason for playing attack damage Shaco in the mid lane is his high mobility. His Q makes him nice initiator for smaller skirmishes, since you can throw a two-shiv poison after criting at the opponents back for insane damage.

My runes are really simple, marks and quants of attack damage, since E deals magic damage armor pen is not so usefull, and a little bit of defenses in seals and glyphs to survive in lane against AP early game, and to lower the damage dealt by attack damage characters mid and late game.

Masteries are also common for and attack damage character, 21/9/0 with magic resist or armor in the defense tree (Depending on your lane opponent) and maximizing bonuses from critical hits, and also taking armor pen and attack damage and attack speed, without taking summoner's wrath. Also health makes you a little bit harder to kill.

Spells. Exhaust and Ignite are my number one choice. You have Q to run from bad situations like ganks, in fight between you and your opponent exhaust is really strong against someone like diana or akali, to ruin his damage output.

I max two-shiv poison first, followed by deceive right after, without taking a single point in Jack in the box. Don't add a point in W unless the enemy jungler is really good, kinda like xin, jax, rengar, and the worst off all, LEE SIN! I don't really need it in fights in lane, just because of the mana wasted and the time spent for placing it for a fear.

At the beginning open with flask, 2 health potions and 2 mana potions. You need to wait in base for the last pot, but it is worthy for sustain in lane. For the rest of my items, i need mix of survivability and high damage. Statikk shiv crits with your Q, and your clone can also product a bolt. Ravenous hydra is must have for teamfights, so you can deal AOE damage both yourself and with your clone. Warmogs goes right after, for survivability, and get followed by a bloodthirster for even more damage output with E and basic attacks, and even more survivability with lifesteal. And i take GA for obvious reasons.

One thing about teamwork, take as much kills as possible, be aggressive, roam, gank with your teams jungler, it makes you really strong in mid game if you get fed as much as possible, which is really important so you can destroy enemies mid game and not be so useless if a game comes to late.

pros:
-hard to gank ( due to Q )
-high burst damage ( With Q crit and chasing while they flee with slow from E and activation for damage if needed )
-if get fed, enemy attempt to surrender in most games
cons:
-easily killed if cc-ed
-******** late game
-oracles ruin your life