This card can be used to Ritual Summon "Magician of Dark Chaos - Black Chaos" or "Black Luster Soldier - Soldier of Light and Darkness". You must also Tribute monsters from your hand or field, and/or banish monsters from your GY, whose total Levels equal or exceed its Level. If this card is in your GY: You can add this card and 1 card that mentions "Light and Darkness Ritual" from your GY to your hand. You can only use this effect of "Light and Darkness Ritual" once per turn.