When this card is Normal or Special Summoned from the hand: You can add 1 "Polymerization" from your Deck to your hand. You can pay 500 LP; Fusion Summon 1 "Frightfur" Fusion Monster from your Extra Deck, using monsters from your hand or your side of the field as Fusion Materials. You can only use 1 "Fluffal Owl" effect per turn, and only once that turn.
