Skilled Dark Magician, known as Skilled Black Magician in the Japanese version, was the third of the five Duelists of Death whom Aster Phoenix Duels. However, it's later revealed, that he and Skilled White Magician were actually Demise, King of Armageddon in disguise.
He and Skilled White Magician Dueled Aster as a team. The only cards seen in their Decks were their own cards, their true form "Demise, King of Armageddon", and "End of the World". Its unknown which of them actually played these cards.
World Championship 2007