Pros + Great Lane Farming with Steel Tempest + Insane mobility with Sweeping Blade + Has no resource to cast spells + Extremely low cooldowns + Wind Wall Blocks Projectiles + High Skill Cap + Nice shield with Way of the Wanderer + Shouts incomprehensible things while casting tornados!

Cons - Hard to Master - Item Dependent - No built-in Sustain * CC vulnerable

Way of the Wanderer Is a really good ability and it´s Yasuo´s passive. It consists mainly on two parts.
* It doubles Yasuo´s total critical strike chance, but also reduces its damage by 10%
* On the other hand, this passive gives him a resource called "Flow", that builds up when Yasuo moves a unit (walks), but also when he uses Flash or uses Sweeping Blade.
This shield activates once a champion or neutral monster attacks Yasuo lasting seconds.
Keep in mind that by using Flash to build up the shield you can actually save yourself from Ignite or some really annoying Noxious Traps

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Steel Tempest is his bread and butter skill. This is what makes Yasuo so strong throughout the game as it provides the ability to apply critical effects and on hit effects, making him a real crit machine.
Each time you land Steel Tempest on an enemy it stacks (2 times) allowing the 3rd cast to launch a tornado skillshot that knocks any enemy units airborne.
If cast immediatelly after Sweeping Blade does an aoe ciclone with the same effect but with a shorter range.

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Sweeping Blade is a targeted ability that serves as Yasuo´s gap closer and escaping mechanism. Basicly it makes Yasuo dash through the selected unit, but keep in mind that after dashing said unit you have to wait until you can dash again ( aprox. 10 to 6 seconds scalling with the ability´s level)

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Last Breath is Yasuo´s ultimate. This skill is what distinguishes a bad Yasuo from a good one. You have to time it properly since it can make the play happen and help your team win the teamfight or you can just screw it all up if cast too soon.
* Last Breath can be cast once a unit or more within range is displaced, with this I mean that Steel Tempest´s tornado, Malphite´s ult and other abilities that displace champions trigger the possibility to activate Last Breath.
* Once cast you travel to the closest unit/s displaced dealing damage and filling Yasuo´s flow bar.
* After the animation you get a buff, giving you (50% armor penetration) for 15 seconds!!