Karthus

the Deathsinger

Mage

Death is not the end of the journey, it is just the beginning...

The build that broke the game

Sorcerer's Shoes

Rod of Ages

Rabadon's Deathcap

Zhonya's Hourglass

Deathfire Grasp

Void Staff

Why it worked

Requiem struck every enemy champion on the map for a flat amount, and Death Defied let him cast it once he was already dead. Lay Waste was nearly free and doubled its damage on a lone target, so wave clear and poke came off the same button. Dying was a tactic, not a setback.