Greetings Summoners, so, i'm new at this so give me some credit, i play Irelia this way since she came out and got really good Results with her like this, this is just an opinion of how about to play her,and i accept constructive critics. Thanks for Looking my Guide.

PROS

High Damage
High Movment Speed
High Critical Chance and Power

CONS

Squishy early mid and Late Game.
Very item / Team Dependant
Life Steal Survive metod
Vulnerable to CC

This Skill sequence is the same as the HeAt Build, because i tested another ones and figured that it is the best one for her (All Credits to HeAt, Thank You). But well, whi this skills sequence?

Because it Priorize your 2 main skills on this playstyle:
Equilibrium Strike: This is your main Source of Damage and CC Until Mid game when your Auto Attacks do nice damage, but always use this skill, it will save ur life so many times and will give you a lot of kills.
Hiten Style: Your Survival main skill, and also boosts your auto attack damage with True damage extras.. Very usefull... Always activate it after
Equilibrium Strike, this will insure Maximum Damage output.
Transcendent Blades: Aah.. your ult.. this is your most powerfull skill, use it when you have sure of killing an enemy. Can be used too for killing low HP Fleeing characters if you have a good aim. Always use it when 1v1 or 1v2 someone, it heals you and damage everyone in the line the blade was thrown away.. it makes 1v2 easy depending who you fightihg.
Bladesurge: Well, the last skill, i have nothing much to say... i think her most usability is to reach fleeing champions to engage with Equilibrium Strike.

Ok, on early game take a point on ur Equilibrium Strike and pick a Doran's Shield. You can go all tree lanes, but Solo lane isn't a good choice, do it only if you are sure you can handle your enemy. Start last hitting minions taking care to do not take damage until Lv 2 when you pick a point on your Hiten Style, then you can regenerate HP faster. At lv 4 you should have Your 3 Skills (Lv 1 BladeSurge, Lv 1 Hiten Style and Lv 2 Equilibrium Strike). Then depending on how much hp you enemy have (if you had chance to harass him) try killin Him with the combro

Q>E>W>Auto-Attack+ Ignite.

This Should give You first Blood or a kill. Just care to look what Summoners Spells you enemy have, dont engage if they have Heal and Exhaust. It will kill you. If he only have one of those, then your free to go.

After a Sucessfull Kill, Farm until Lv 6 and Hello Mid Game!

Well This is when things start to get fun. by this point you should have like lv 6 or 7 with 1 kill or 2... using Your Berserker Greaver already. Next thing to focus now is to search for ganking oportunities whili you keep your lane. You need to fed yourself and always have a higher lvl then your enemies (reason for the Exp Masteries). When have a chance grap a Vampiric Scepter, this will be enough to heal you on minions fast enought to keep you in lane. Harass a lot with your equilibrium strike, just care to do not be catch in a gank while doing it.

Always using the same combo to kill : THIS IS A RULE,USE THIS COMBO ALWAYS TO KILL

Q>E>W>Auto-Attack

But now instead of only using this, you will use Your Ult too, i will be like that:

Q>E> R >W > R >Auto-Attack> R > Auto-Attack R >

this is my way of doing lots of damage, while you attack, keep pressing R to throw blades on then, this will heal you and kill your opponent fast then he can imagine.

Well, the Main thing here is try to get fed ASAP. Then Grab a B.F. Sword and Rush The Black Cleaver. After doing her, get a Zeal and then turn your Vampiric Scepter into a Executioner's Callin. This will give critical chance and more lifesteal (and a good little DOT of 4 of damage)

After have this... Rush Phanton Dancer and Bye bye Mid Game

If you got here without then surrendering, you should be the Nightmare of every solo on they team, you can cut then appart with your combo and auto attacks, taking low damage due to your Life Steal cababilities. here, focus destroying towers to rush win while killing People when the opportunity appears (probably will be harder to kill because they will be together, and please dont dive on then... your not a god REMEBER! 1 stun... and your done) Focus on Towers.... and Inhibitors.. Finish your Infinity Edge and if you have time and do the Final Rush with your Team.. (can doo baron too, ur wish...)

You will rarely get the point to fill all six itens... its a really expensive build.. but is worth it in the end..

Well, this is how i play her, hope your guys like it and give some feedback, Thank You and Enjoy this Little cute Carry with four Blades. ^^