Why this build works ?

Cause it's Shaco!

If you get ganked, you can Deceive out of that, and traps help you with having more vision to prevent those ganks.

It's more focused against physical damage champions, so it's not so effective against magical damage, but with the current meta this build should work most of the time

This build gives mostly sustained damage, but when you begin the fight, you begin it

HARD :

• nice early game magical damage
• % current health as magica damage
• nice bonus damage with low CD
• combined with
• aa refresh, and damage based on your max health
• passive Crushing Blow

It all hits the enemy Almost instantly dealing heavy damage to them, and I didn't even include skills into it.

Apart from the damage you get some nice defensive stats, that allow you to continue dealing the damages, or just leave with nice amount of healt to strike them heavily again in a few seconds.

Overall damage would be mixed, so the enemy would have hard time trying to defend against it.

Pros + Easy escape + Better vision with Jack In The Box + Good Damage AND Defence + High mobility + BIG nearly instant damage + Jack In The Box and Hallucinate are really good to have fun with the enemy + Mixed damage output + Good on 1v1 + Teleport AND ignite!

Cons - Squishy early game - Easy to poke - No other escape when Deceive is on cooldown - Takes time to learn how to be a (good) Jester - When you don't have , or you're probably as good as dead - It can be hard to lure enemy to trap spots - Control Ward, Sweeping Lens and Oracle Lens counters half of your tricks - Better against physical damage team

quints Greater Quintessence of Attack Damage: This Quint gives us early game threat to the enemy, and some nice skill scaling marks Greater Mark of Lethality: This Mark gives us slighly bigger threat to the enemy laner, and a lot bigger damage against enemy carries Greater Mark of Critical Chance: This Mark gives us small chance to change the duel by suddenly dealing A LOT of damage glyphs Greater Glyph of Scaling Magic Resist: This Glyph gives us late game scaling against mages Greater Glyph of Scaling Mana Regeneration: This Glyph gives us late game scaling to use spells more often seals Greater Seal of Armor: this Seal gives us early defence against enemy Greater Seal of Mana Regeneration: this Seal gives us early game Mana regen to damage the enemy and stay longer in lane

Remember. You can always change the mana regen runes to defensive ones if you don't need that much mana. You can also change scaling mana for flat mana or vice-versa. It all depends on your playstyle.

So why do we pick skills like that ?

• Ultimate is maxed whenever possible. without question.
• Two-Shiv Poison comes next. It gives us better damage and higher slow. We stop after level 6 to have a longer fear on traps to deal more safe damage and to have a bit more time to escape from ganks.
• Jack In The Box is not as important as Two-Shiv Poison only because it's damage is not so reliable, and the traps can be easily destroyed.
• Deceive comes last and is almost untouched untill late game. Why? You'll mostly need it for escaping, or jumping from bush to bush to confuse the enemy. Jumping at the enemy, or avoiding some skillshots is also nice, but for that we don't need to level up this skill more than needed.

Teleport is a must for a top lane, and since we have Flash in form of Deceive we can take here some other spell. For example offensive spell like Ignite to help us with dealing damages.

YAAAAY!

This item is for early sustain. Recommended if going aggresive

This is for more passive laning

This just give gread damage boost and is a bread and butter item for Shaco

Really nice boost for Trinity Force and great boost in defence

Some defence against that mid laner

Helps with wave clearing, and makes offensive use of that health that we are stacking

Better defence against ADC, and better mobility

Something to hit that 40% CDR

Farming. Yeah, about that...
As I said dealing with enemy that can easily poke you can be hard, so it's possible you'll just keep farming under your turret, but apart from that you should be ok.
Some poking/farming with Two-Shiv Poison or denying some CS by scaring enemy with a trap.
Remember to ward yourself at lvl3 to defend against incoming gank.

There's also one thing that can help you with laning, but you'll probably need some of your junglers help and you'll have to get Jack In The Box on first level, and Two-Shiv Poison on the second one. Since you are Shaco you should destroy any camp with traps. This can allow you to take your Red buff, or Blue buff. Or the enemy Red buff, or Blue buff. It all depends if your jungler will need buff on your side of the map.
Taking the enemy buff can put you team or at least jungler in an advantage, but you'll need some warding in the enemy jungle to know where they are.
You have to also remember, that taking enemy junglers buff can lead to their early gank on you.

Shaco on lvl 18 with full build. Enemy resistances not included, but remember we have 18.8 Lethality, and 1.5 Magic penetration (not much, but we have it).

117 base max ad + 25% = 146.25
6.75 AD from Runes
10AD from Masteries
115 bonus from AD Items
131.75 total bonus ad

15ap

2010 base max health
1600 items health
3610 total health

spellblade 292.5 physical damage
Titanic Hydra 5 + 36.1 = 41.1 physical damage
Titanic Hydra active 40 + 361 = 401 physical damage
Dead Man's Plate 100 physical damage
Fresh Blood 28 physical damage
Greenfather's Gift 3% target's current health as magical damage
Thunderlord's Decree 180 + 39.525 + 1.5 = 221.025 magical damage
Assassin 2% more damage
We leave Battle Trance since it's for longer fights
862.6 total physical damage
With 2% bonus it's :
879.852 physical damage
225.4455 magical damage + 3,06% target's current health as magical damage

146.25 base ad + 131.75 = 278 with Backstab it's 361.4 physical damage
Two-Shiv Poison 210 + 11.25 + 98.8125 = 320.0625 magical damage + 8% of target's missing health as magical damage
We add to both of them Sorcery and Assassin bonus
With 4% bonus it's 375.856 physical damage and 332.865 magical damage + 8.32% of target's missing health as magical damage

Summarizing:
1255.708 total physical damage
558.3105 total magical damage + 3.06% target's current health as magic damage + 8.32% of target's missing health as magical damage
If we'll add on top of that some damage from the trap + fear time to give the enemy no time for reaction and bonus damage from the clone, then the carry should be dead until he can react.

This build allows Shaco to be pretty tanky and still dead A LOT of damage instantly.
As you've read before, it's not some godlike build, but if played correctly it should drive your enemies crazy.
Shaco is really fun to play, and when you can play him pretty safely you don't get so stressed when making some small mistake, because you don't get punished so hard for that.