This is Shaco Physical Damage build for Dominion mode.
I win 80% of the games with this build.

It abuses the meta of the dominion mode.

I will show what to take, and at the end, explain why.

9 red Armor penetration
3 gold Armor penetration
9 blue Cooldown reduction per lvl
9 yellow Critical damage

Take everything from offence on the left side + Havoc 3/3, sorcery 4/4 and arcane knowledge 1/1.
You should have 29 points in offence. The last one goes to good hands in utility.

Your target is to finish INFINITY EDGE as soon as possible

1/ Start with PICKAXE (+25 dmg) and BOOTS lvl 1

2/ On the next stop, if you have enough money for any IE component, buy it. If not, finish BOOTS OF MOBILITY

3/ After you have IE and Boots of mobility, get BRUTALIZER and upgrade it into Youmuuse Ghostblade.

4/ After that get a new Brutalizer.

5/ At this time, the game should be over. If not, get The Black Cleaver.

The the beginning, take all 3 skills.

Your main skill is DECEIVE. Max it as soon as possible. The only exception is your ultimate.
Next is the Box, max it after deceive. Finish with two shiv.

Ghost and Ignite.

We play dominion.
1/ you will die alot more than usual
2/ increased mana and health regen
3/ lots of heals around the map
4/ specific area ideal for ambush
5/ you see alot from map, usually populated with injured heroes
6/ you dont have to farm to get money
7/ players tend to build glass cannons
8/ Dominion map is one big round. This round is made from rocks. Our deceive can jump across these rocks.

With the masteries, runes and items above, we have the following.
Around 250 dmg
66 armor penetration
44% chance for crit
270+% dmg from crit
our deceive gets bonus from our crit runes and masteries
nice CD reduction (around 35 at lvl 18?)

This is not a normal guide. If you never played AD shaco before, find another guide and learn the basics. (how to position deceive, attacks from behind and so.)

Your task is to finish injured enemies. Watch the map and attack everything below 50% hp. With your ulti, you can even miss one turret hit or some ultimates. Using deceive, you can approach most of the champions without notice. Just run in the inner circle and jump across the rocks. Or plant some boxes in the bush and wait for the enemy. This takes some time to master but you can kill squishy targets in 3s before they can even hurt you. (some players watch the towers whilst running there), not expecting your ambush.

armor penetration 66 at max gives you clean hit everytime you score. Brutalizer and Ghostblade stacks their unique effects.

You are fast. If you are hurt, go and get some healt from those red crosses around the map. Dont forget to place there your box. Place your box everytime you can and have spare mana. Harras with Deceive even if you know you cant kill them. They dint see your CD and most of the players will refuse to fight someone who can instakill them on next CD. Cover your team with boxes, you can save their life.

And dont waste any money for defence. This is dominion. You have to go home from time to time. You have to spend your money, refresh HP and mana. You will never get enough hp from lifesteal items. Armor and Magic resist is for people without stealth and for people who fight fair.