Hello guys! This is the first time doing a build here! So please be kind (:

If someone have a tip, please write it, I would really appreciate that!

Summoner spells.
I always take Ghost, but Exhaust can also be very useful against high dps-champions.
Tip? Please comment!

Why Critical chance runes?
Yes, these runes comes very useful to First blood, Harrassing, Creepkilling escpecially in early game.
If playing with these runes + masteries u got 19% crit chance! Always go for First blood, you'll tear your enemies in to pieces!

About this subject can I just say 1 thing, MAX OUT Wuju Style for greatest damage!
But Meditate is also good if you're not laneing with healers to stay in lane as long as possible1

1st. Dorans Shield / boots (if laneing with healer)

2nd. Youmuu's Ghostblade, More crit. chance, also armor penetration + atk. speed and movement if activated comes very handy for GANK!

3rd. Go for BF Sword and upgrade it to Black Cleaver for more dmg and "armor penetration" + atk speed.

4th. Blood Thirster for (More dmg) lifesteal because of his low healthpool.

5th. Phantom Dancer more crit chance, atk speed and move speed! Can it be better? :D

6th. Purchace order is who you're laneing against! Many "tanks", go for madred's bloodrazor!
Many "low health-pooled Champions" go for Infinity Edge for maximum Humiliation! Muhaha :D
Or maybe Frozen Mallet?

Other tips? Don't be shy, please write it in comments!

Try to go with great support-heroes like; Sona, soraka, (more?).
Try to talk in Ventrilo, Skype (more?) for the best teamwork!
Get help from your partner to get the Red Buff for the slow!

That's all for me (this time) and I say it again, If you got tip, advices?! Please comment! (:
Last time played Yi: 30/10/15 (all death's is cuz i was too greedy)
Cheers &
Tack f'o'r mig! :) (And sorry for my bad english)