You can substitute this card for any 1 Fusion Material Monster. When you do this, the other Fusion Material Monster(s) must be the correct one(s). Discard this card from your hand to the Graveyard to add a 'Polymerization' from your Deck to your hand. The Deck is then shuffled.
![King of the Swamp [DR2-EN195] Common](http://www.cardmerchanttakapuna.co.nz/cdn/shop/products/6e2aaf8e-594b-56e3-96c6-60eb9c0143d0.png?v=1698537546&width=1445)