This card is used to search for "D.D.R.", which is then used to Special Summon "Dark Magician of Chaos". During the End Phase, that monster's effect can be activated to retrieve this card, which can be used again if "D.D.R." is sent to the Graveyard (since "Dark Magician of Chaos" banishes itself whenever it leaves the field).
This card can form a combo in a "Lightsworn" Deck.