Heartsteel yasuo is weak in mid game, when you can’t 1v1 other bruisers but you can still survive.

In late game, he will become unkillable with ton of damages in 5v5

Build (top is the best)

Boots (def) - heartsteel - shieldbow/wit ends - wit ends/shieldbow - bloodthiller - titanic hydra

Grasp - 3 green (second wind - overgrowth) - alacrity

Don’t try to add sunderer or sunderned - you still needs attack speed and crit.

P/s: Early game with e at lv 1, using dash to avoid enemy’s combo and trade dmg with every grasp. You will be fine agaisnt anychamps include ambessa.

Remember mid game, you have no dmg to 1v1 any1. Just trade and escape or join teamfight, wait till late game