This card in your hand, field, or GY can be used as a substitute for any 1 Fusion Material whose name is mentioned on the Fusion Monster Card, but the other materials must be correct. You can discard this card to the GY; add 1 "Polymerization" from your Deck to your hand.
![King of the Swamp [SBC2-ENI23] Common](http://www.dungeonsandjavas.com/cdn/shop/files/ygo_placeholder_67806b40-b9b2-487b-9cca-b400560601f8.png?v=1733759788&width=1445)
