The reason this build will never EVER work in any form of league of legends match is that 1) It is soooo expensive. It costs over 15k gold. So you say this is for 3v3s, well in 3v3s, your lucky to have maybe 150 cs which is about 3.3k gold. Which means that the other 12k gold is coming from kills, that means that you need about 30 kills to pay for this build. So unless the enemy team you are fighting has a completely brain dead, you will never get this amount of gold. 2) This build offers no survivability. I know now that you are dying to shout at me that you have enough lifesteal to tank any amount of damage but Im gonna stop you right there and tell you to shut up because you have no idea what your talking about. Lets just say for a second that there is a Malzahar on the other team. And you have decided to go with your stupid build. Now lets say that you go into this fight. If the enemy team has a sliver of intelligence this is what is going to happen: Malzahar will see you, he will pool under you while you will try desperately to kill him, he will proceed to ult on you where you are frozen, on top of his pool, suppressed for 2.5 seconds (And mercs dont shorten suppressions so those wont do anything for you) while the enemy team will hit you with two more skills and BOOM, your dead. You cant attack anything while you are suppressed so you cant lifesteal, you cant lifesteal your gonna die. Also, lets say something far more common happens, you fly into a team fight and you get exhausted AND ignited, now your are dealing 70% reduced damage and your healing for half of what you should be. Your then focused and BOOM once again, your dead. 3) The item you are rushing only gives attack speed and lifesteal. So yeah, its cool that you attack really fast, but too bad you do no damage because you are leveling Alpha strike over Wuju Style, and thus cannot gain any health back. Also, you have an ult that gives you just as much attack speed at 6. Your far better off rushing some form of damage as your first item.

However, I am done criticizing your build. If you cannot realize that it is bad after all this evidence then I see no hope for you. However, I will give you a better build. Rush a Wriggles, since any build that Yi has requires lots of farm, it is useful for killing creeps. Also it gives Attack Damage, Lifesteal AND Armor, all things Yi needs. Boots of course are situational, Greaves, Mercs or Tabi are the viable ones. Next you can either build Atmas Impailer or Warmogs. If you have 2.3k gold after buying your wriggles and boots then you should buy Atmas first, if not build warmogs first. After that, it's pretty much up to you. If you want super DPS then you build Infinity Edge next along with a bloodthirster. If the game is going on long enough sell the wriggles for Starks. Or if you want more survivability (which I can tell from your build recommendation, you probably dont) Banshee's Veil and Wit's end are great options.

So whether or not you take my advice or not is up to you. However, I think you will notice that you will have better luck with Bulky DPS Yi. Sure, you might beat the living hell out of a few teams with pure DPS Yi but you will notice a lot more consistency with Bulky DPS Yi.

You just farm the jungle (be sure to have it warded) and go back and forth between both lanes. I usually have more creep kills than both of my allies combined at the end of a game.

How are you ever going to farm all this in a 3v3 match? You're lucky if you reach one or two items :o

Why? Please explain to me oh great and wise poster, why is this a terrible build? What's wrong with it, why won't it work, and what should I build instead? Keep in mind that this build is for 3v3s.

Terrible build

Troll? This build will win games. 30% crit and you're hitting for 400 dmg twice every second plus the extra swing from your passive, and 95% lifesteal?! You can literally 1v3 teams if they only have 1 stun.

Stupid troll >:(

Wow lol, that's rape.