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 (CR) [JUSH-EN046] Collector's Rare](http://paradoxtcg.com/cdn/shop/files/645265.jpg?v=1755875323&width=1445)
