Cannot be Normal Summoned/Set. Must be Special Summoned (from your Extra Deck) by Tributing 1 "Blaster, Dragon Ruler of Infernos" by the effect of "Metamorphosis". When this card leaves the field: You can banish 1 "Burner, Dragon Ruler of Sparks" from your Graveyard; Special Summon this card from your Graveyard. If you do: Return this card to the Extra Deck during the End Phase and Special Summon 1 "Blaster, Dragon Ruler of Infernos" which is banished. Then add 1 Dragon-Type "Cocoon" monster from your Deck to your hand.