Arkana
is one of the few duelists who worked for Marik of his own free will. He
had been devastated by the loss of his assistant (failed magician) and lover
(she was one and the same in case you missed that). Marik convinced him
that he would get them back together if he defeated Yami. But, of course,
that was a lie. he uses a Dark Magician deck specifically designed to take
Yugi down. But he has no respect for the game or his cards...