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You can only get 1 copy of "Polymerization" when you discard "King of the Swamp" from your hand.
The ① effect doesn't apply while in the Deck. You can use this card in the Deck as Fusion Material as the WATER for "Elemental HERO Absolute Zero", but you can't use this card in the Deck as Fusion Material as the "Cyber Dragon" for "Chimeratech Overdragon".
You can activate the effect of "King of the Swamp" even if all 3 of your "Polymerization" cards are in your Graveyard.
You can't use the ① effect as a Specific Material for "Contact Fusion" like "Gladiator Beast Gyzarus".
If "King of the Swamp" is selected for the effect of "Prohibition", you cannot use either of its effects.
You can onlt use the ① effect for a listed card name, like "Cyber Dragon". You can't use it for a generic name, like "1 "HERO" Monster".
Discarding this card is a cost.
If you use "King of the Swamp" as Fusion Material from your hand, you do not get to activate its effect to search your Deck for "Polymerization".