Effect
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.
Regarding "This card cannot be Normal Summoned. 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": - This is not treated as an effect. - A Chain Link is not created when Special Summoning this way. - Banishing a monster from the GY and Special Summoning this card do not happen simultaneously. - This card can only be Special Summoned by this method. Even if this card is sent to the GY or banished after being Special Summoned this way, it cannot be Special Summoned by the effects of other cards.
【Regarding the ① effect】
This is a Trigger Effect that can be activated in the Graveyard.
It can also be activated during the Damage Step.
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