This is a casual guide so read it:) Is not alot of words is simple and easy to use for all players:)
Skills


Double Strike - Master Yi strikes twice every 7th attack.

Passive that every 7th can take out great amount of oponent HP pool without any problem. Scales with your accual damage (also with enhanced by Wuju Style skill).
Timing it will be a nice thing now. Remember that when counter hits 6, this means your next atack will deal 2x damage. It means you can Alphastrike and double damage oponent. Good for harrasment.
Extremaly usefull in early game when every % of hp matters, as well as in late game when you diliver 1k crits (double 1k crit? shiny?).


Alpha Strike - Master Yi leaps across the battlefield with blinding speed, dealing magic damage to multiple units in his path with a chance to deal bonus magic damage to minions.
Master Yi leaps across the battlefield striking up to 4 enemies, dealing 100/150/200/250/300 (+1 per ability power) magic damage to each enemy with a 20/30/40/50/60% chance to deal 400 bonus magic damage to minions.
Cooldown - 18/16/14/12/10 seconds
Cost - 80/90/100/110/120 Mana
Range - 600

In my playstyle, this is my initiate skill, as well as escape mechanism (but this is very mob dependant escape mechanism)
Basicly you "rush" through 4 targets (mobs) and land a final blow on the targeted champion/mob spawning near him. You cant hit same person multiple times. You cant jump back to char that was already "touched", so catching 2 heroes alone wont mean you hit both of em 2 times, the spell will break after 2 jumps. This skill ignores your melee damage, damage is magical and gets lowered by magic resistance.


Meditate - Master Yi rejuvinates his body by focus of mind, restoring health and increasing his armor and magic resistance for a short time.
Master Yi channels, restoring 140/280/420/560/700 (+1.65 per ability power) health over 5 seconds. While channeling, Master Yi gains 100/150/200/250/300 armor and magic resistance.
Cooldown - 35 seconds
Cost - 70/85/100/115/130 Mana
Range - Self

Very underestimated skill. In late game it can be whole diference between going back to base or stay in lane and push another tower.
It might be good idea to take a single point in in in early game if you are getting too much harras damage.
Not much usefull in late game since you will regain more hp and faster and more efficient by just farming mobs with lifesteal.


Wuju Style - Master Yi becomes skilled in the art of Wuju, passively increasing the power of his physical attacks. Activating Wuju Style doubles the passive bonus damage for a short time, but the passive bonus is temporarily removed after the effect wears off.
Passive: Increases physical damage by 15/20/25/30/35.

Active: Master Yi can activate this ability to double its effectiveness for 10 seconds, but this removes the passive bonus until Wuju Style becomes available again.
Cooldown - 25 seconds
Cost - 40 Mana
Range - Self

Your primary skill. Passivly increases your swing melee damage. On Use you get up to +70 damage. Cannot be boosted by anything. Great skill early game. Scales with Double Strike.


Highlander - Master Yi moves with unparalleled agility, temporarily increasing Master Yi's movement and attack speeds as well as making him immune to all slowing effects. Additionally, killing a Champion refreshes all of Master Yi's cooldowns.
Increases Master Yi's movement speed by 40% and Attack Speed by 40/60/80%, and he becomes immune to all slowing effects for 6/9/12 seconds. Additionally, killing a champion refreshes all of Master Yi's cooldowns, and scoring an assist reduce the cooldowns by half.
Cooldown - 75 seconds
Cost - 120/120/120 Mana
Range - Self

Use your ulti more often. It have a short cool down and it is the most important skill for master yi.

Why? ghost and exhaust? okay for ghost. i cant chase up with him after my highlander. on ghost and oops he is gone. u can use it tooo after u revive for guardian angel. exhaust? kill him! u get it rite:) use it on him while you are on highlander and he is gone.

Why these items? Let me tell you why. :) The first 4 items is basic for master yi. If you follow the sequence get ready to own:) and i can assure u that u will get to try the 5th and 6th item build. let me tell you why guardian angel and warmog. Guardian angel is good becuz u go in to a fight wack their *** off, 2 to 3 will die and the last 2 or 3 will target u. this is why u nid a guardian angel. go in wack all their ***, opponent aim u and will say" eh wait u have guardian angel shud i wack u ?( greedy people will think that:) and thats why." they hesitate and that person gone OOOPPPPSSSSSSSS!:) In the other case, opponent kill u but u get revive and all of them will move out of the screen running for their life. this is what u do: meditate press ghost and chase them and the next thing u will hear from your computer is ACE:)!!!! why warmog???? warmog. simple phrase u will say to urself when u get warmog. " Eh did i juz score a quadra kill OH lala!" U know why, u got a higher chance of survival and the opponent look at your life and say " lets target the softer one!" . with guardian angel and warmog it gives u 68 armor 38 magic resist and 900 health did u juz transform into a semi tank super dps master yi? pls rate this buid after u used it :)

Magic resist runes why? Oh simple case . lets say veigar and Leblanc, full combo . They will say" wait why didnnt that yi die? **** him. Oops i died..." this is why:) crit damage runes? EASY:) smack their face easier.