After nuking the field with "Chaos Emperor Dragon - Envoy of the End", use the above card's effect to summon this card. Between its ATK gain and the damage from "Chaos Emperor Dragon's" effect, just one direct attack from this card will be needed to OTK your opponent.
Use this card with "Last Turn" for an OTK. More often than not, there will be few monsters in the opponent's deck that can take down a 3000 ATK "Theban Nightmare".
Play this card with Cold Wave to have 3000 ATK beatstick that can get one or more worry-free attacks.