White Dragon Wyverburster

Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by banishing 1 DARK monster from your GY. You can only Special Summon "White Dragon Wyverburster" once per turn this way. If this card is sent from the field to the GY: You can add 1 "Black Dragon Collapserpent" from your Deck to your hand.