Effect
If this card is sent to the Graveyard as a Fusion Material for a Fusion Summon: You can target 1 "Polymerization" in your Graveyard; add it to your hand. You can only use this effect of "Fluffal Cat" once per turn.
The monster effect "①: If this card is sent to the GY as a Fusion Material for a Fusion Summon, you can target 1 'Polymerization' in your GY; add that card to your hand" is a Trigger Effect that can be activated optionally. (It targets 1 "Polymerization" in your GY.)
If "Fluffal Cat" is sent to the GY as a Fusion Material for a Fusion Summon, you can activate its effect regardless of whether it was sent to the GY from the hand or the field.
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