Olaf

Strengths

Olaf can combine Berserker Rage, Vicious Strikes, and Ragnarok at low life to become deceptively strong.
The bonus healing granted by Vicious Strikes amplifies your Life Steal from all sources as well as heals from allies.

Passive · Berserker Rage — Olaf gains Attack Speed and Life Steal based on his missing Health.
Q · Undertow — Olaf throws an axe into the ground at a target location, dealing damage to enemies it passes through and reducing their Armor and Move Speed. If Olaf picks up the axe, the ability's cooldown is reset.
W · Tough It Out — Olaf's Attack Speed is increased and he gains a Shield.
E · Reckless Swing — Olaf attacks with such force that it deals true damage to his target and himself, refunding the Health cost if he destroys the target.
Ultimate · Ragnarok — Olaf passively gains increased armor and magic resist. He can activate this ability to become immune to disables for as long as he keeps attacking.

A suggested 5-lane lineup built around Olaf, based on hero partnerships and role synergy — not win rate.