Welcome to my first champion build for Master Yi. This guide is made for you that want to be the best in your team if you dont feed them. The point with 2xis that when you stack them up you will get more damage and 50% life steal. If you are a good player you probably know that when you kill a enemy champion your skills reset. If you got full hp and two enemy players are hunting you, you will at least get down 1 off them if you did use your ultimate after the kill you get full hp.

Why did i choose this runes? I took 6xis that you will get Critical Damage. When you crit you will get more hp and more damage on the target. 3x3x. I took this rune because if you have a target on you, you will get more damage on him, because his armor will be lower.
I did take 9xbecause you will need more hp in the start and later in the game if you are going to gank 1n2.
I did take 9xbecause i think that can be in good use if you are hunted off a sick magic dps like annie or veigar.

The start items is for little more movement speed so you can get out your first blood easy. When you done you use your hp pots and mana if needed. 2xis for 50% life steal and more damage when you are hunting a target. 2xis for the movement speed, critical chance and attack speed.
1xyou get magic +38 Magic Resistance and +68 Armor of it, and if you got the bad luck and dieing in a team fight, 1n2 or anything you will get revived and you will get a second chance to kill your target, but it has a cooldown on 5 minutes.

You can see that my masteries are simple as everyone else. You can change them if you want but i think this one is good. I did put 1 in cripple because that will help your exhaust. And i use the 21/0/9 Build as you see.

I took flash and exhaust because exhaustslows movement speed by 40% and reduces auto/basic attack damage by 70% and ability/item damage by 35% for 3 seconds. Flash i took because sometimes you want to escape from a fight or go for a kill. With this you can easy get the first blood out. If you are level 6 you can tower dive them, and when you got the kill you escape with flash. I done it many times and it always working.

When your team is going for the team fight on top, bottom or middle lane. Make sure you stay back till your tank start going in to the fight. If you wanna stay alive and get out the kills. Stay back till your tank are in the massive group of enemy's, and your damage dealers have start to dps. Then you go in and use ulti if you get the kills your ultimate resets, then you use it again to get the other kill.

1v2
If you are going for the kill on someone but they are 2 vs you? Try to go for the weakest one with your ultimate. When you get the kill if you still got your ultimate running runaway and if you need flash to a bush and wait there for your target. If he is not after you if you got life steal go and kill some minions then you use skill 3 when you starting to get close then 4 and when he are running away or are at low health go with 1. Then you get the kill and you can meditate for some health.Now when you getting close to your last enemy againif neededand there you have a double kill.

1v1
If you are fighting against one target damage dealer just try to get the enemy's health down and then you use your skill 3 then ultimate skill 4. When he running away use skill 1 to get him down. Easy rotation.if needed flash and hit or use your alpha strike.or

You can play him different ways but i think its best if you find it out your self. You will still do that later. But my tips above can be a big help.