Naafiri vs Yasuo

Recast Darkin Daggers (Q) on a target that's already bleeding: the second dagger deals the rest of the bleed plus damage based on their missing health, and heals you.

When your pack has taken hits, cast Eviscerate (E): your packmates come back to you at full health.

Cast The Call of the Pack (W) just before you engage: you're briefly untargetable, your pack grows, and you gain AD and move speed.

Push your wave, then roam toward an isolated champion: with Hounds' Pursuit (R), you and your pack dash onto them, and a takedown lets you recast it.

Hit him with a cheap attack to trigger the Way of the Wanderer (passive) shield, then start the real trade: otherwise, it absorbs your best damage.

If you have projectiles, save them for after Wind Wall (W): it blocks them all for 4 seconds, on a 25 to 17 second cooldown. Other spells go through it.

Don't stand right behind your minions: each one gives him a target for Sweeping Blade (E), and he gets closer to you with every dash.

Get out of the line of his whirlwind, the third Steel Tempest (Q): without a knock-up, he can't cast Last Breath (R).

Judge his threat by his crit items more than his level: Way of the Wanderer (passive) raises his critical strike chance, so each crit item does more for him.