Question: what is the difference between dark magician of chaos and magician of black chaos?
Answer: Magician of Black Chaos is a Ritual Monster, he's only great in Spellcaster if you like Yugi Moto Deck or easily summon Sorcerer of Dark Magic. Dark Magician of Chaos is a banning Effect Monster; whenever he is dead, he removed from play instead of attend to graveyard.