Olaf is a broken character.
AS boost, Lifesteal, Beserker and Glacial.
Built with Bloodthirster, Phantom Dancers, Warmogs.
His health bar will not drop, the Glacial stun is at a near 100% uptime. And is completely able to solo 6 units that have 100% Berserk effect and 100% Armor reduction with several Giant Slayers and other on proc effects.
Olaf at Two Stars is SOLOING with those items against a near full team with almost full health without taking damage.