Yasuo rework concept
It's no joke that Yasuo is extremely frustrating to play against. His kit is simply way too overloaded, there isn't much else to say. He's too safe, he's too mobile, his damage is insane, the list goes on. So here is my take, on making this obscenely powerful champion, and making him balanced.
Passive: Way of the Wanderer: Every 3 seconds, if Yasuo has not attacked or used any abilities, he sheathes his blade and gains the buff "Sheathed." Attacking or using an ability will consume the Sheath buff. Some abilities gain bonus effects if used while he has Sheath. While Yasuo has Sheath, his crit chance doubled.
Q: Steel Tempest: Katanas are not made for stabbing! Yasuo SWIPES the area in front of him, in a crescent shape (think Diana's passive) dealing physical damage. After using this ability, Yasuo can cast this ability again after an initial cool down of 1 second before it goes on it's actual cool down. If Yasuo casts this ability 3 times, the third Steel Tempest will knock enemies back, deal higher damage, and then cause Yasuo to instantly sheath his blade. Steel Tempest is immediately put on cool down after the 3rd cast. This ability does not reset Yasuo's auto attack timer.
Sheath Bonus: The swipe from Steel Tempest will also block all enemy projectiles it hits. Additionally, Steel Tempest will apply on hit effects this one time.
W: Wind Wall: Yasuo slashes the ground, creating a wall of wind that travels in a line, blocking all projectiles that come into contact with it as it travels for 4 seconds. If the Wind Wall blocks an increasing number of projectiles as it levels up, it will disappear early. (It's about the size of Ezreal's ult)
Sheath Bonus: The Wind Wall is bigger can block more projectiles.
E: Sweeping Blade: Yasuo dashes a fixed distance through a target, dealing magic damage. If Yasuo dashes through an enemy champion, he gains a small movement speed buff.
Sheath Bonus: Yasuo can dash an additional 2 times, but not through the same target.
R: Last Breath: After a brief delay, Yasuo dashes through a target at lightning speed, dealing physical damage based on how low his target's HP is to both him and his target.
Sheath Bonus: Last Breath deals noticeably higher damage, and will also cause Yasuo to sheath his blade right after.