King of the Swamp is a Rare Effect Monster card from Yu-Gi-Oh! (Ancient Sanctuary, AST). Current market price: $0.12.
Rare
Ancient Sanctuary (AST)
Card Text
This card can be used as a substitute for any 1 Fusion Material whose name is specifically listed on the Fusion Monster Card, but the other Fusion Material(s) must be correct. You can discard this card to the Graveyard; add 1 "Polymerization" from your Deck to your hand.
