Hey GailardiaG, I took some notes off of what you said and made some adjustments, Thanks again :)

1st off change the cdr masteries to the attk spd ones cause yasuo's q is on a shorter cd with more atk spd. second forget butcher and feast cause spell and blade weaving stack easily on yasuo while your csing and once your at 4 stacks of sweeping blade go in for the huge harass damage. also double egde for expose weakness. I would also put the point in dangerous game into devastating strike but thats a variable one so it isnt as crucial. Now to the build: if your going to build life steal dont go hydra go BT. Also add BV into your situational items as it is a must have against a heavily fed and dangerous mage. As for runes the 3 9 9 9 isnt necessarily your best bet. you should play around with your runes to your own liking but having the 5% crit chance amongst them some where. also you need to consider that his flow increases based of MS so movement quints are awesome on him. But as i said play around with your rune page for yasuo.

Hey. Thanks for commenting. It's nice to know people like my build!

Nice guide my friend, I'm also 15 and I main Yasuo and Katarina. I play on the Oceanic server. All in all good guide build wise. ^_^