| Set: |
Speed Duel: Battle City Finals |
| Card type: |
Effect Monster |
| Rarity: |
Prismatic Secret Rare |
| Attack: |
500 |
| Defense: |
1100 |
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 (PSR) [SBC2-ENI23] Prismatic Secret Rare](http://cardcastergames.ca/cdn/shop/files/ygo_placeholder_113c95cf-7df1-49ae-9c78-e932c45a2c73_800x.png?v=1733769673)
![King of the Swamp (PSR) [SBC2-ENI23] Prismatic Secret Rare](http://cardcastergames.ca/cdn/shop/files/ygo_placeholder_113c95cf-7df1-49ae-9c78-e932c45a2c73_1024x.png?v=1733769673)
