Yi Sun-shin: Best build, Counters

Heavenly Vow

Yi Sun-shin attacks with his longbow or glaive based on his distance from the target.
Weapon Mastery: After each weapon swap, his next 2 Basic Attacks gain extra Attack Speed and deal 70% and 55% Crit Damage respectively. He also gains 15% Movement Speed for 1s.

Traceless

CD: 12 Mana Cost: 50

Yi Sun-shin dashes forward and slashes with his glaive, dealing 150 (+40% Total Physical Attack) Physical Damage and gaining Control Immunity for 0.4s.
Each Weapon Mastery triggered reduces the cooldown of Traceless by 1s.

Blood Floods

CD: 11 Mana Cost: 60

Tap: Yi Sun-shin slashes swiftly with his glaive, dealing 240 (+80% Total Physical Attack) Physical Damage.
Hold: Yi Sun-shin shoots a powerful arrow forward, dealing 240 (+80% Total Physical Attack) Physical Damage to the target (damage scales with hold time, up to 200%).
Casting this skill immediately triggers Weapon Mastery.

Mountain Shocker

CD: 60 Mana Cost: 150

Yi Sun-shin summons a turtle ship and reveals the whole map for 2s. The turtle ship lasts up to 10s, during which he gains 70% burst Movement Speed (decays to 20% over 2s).
Use Again: Yi Sun-shin commands the turtle ship to ram the target area, dealing 160 (+50% Total Physical Attack) Physical Damage to enemies in the center and stunning them for 0.8s. Meanwhile, he commands the naval fleet to launch 3 waves of cannon attacks over a larger area. Each wave deals 160 (+50% Total Physical Attack) Physical Damage and slows enemies by 30%.
Casting this skill immediately triggers Weapon Mastery.