Yu-Gi-Oh! · Fusion Enforcers

King of the Swamp

French name: Roi des Marais

FUEN-EN040Super Rare

King of the Swamp (Fusion Enforcers FUEN-EN040) has a market price of US$2.16 to US$2.66 as of Nov 10, 2026.

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Price guide

The market price on TCGplayer, in US dollars: a guide, not an offer.

Market price

UnlimitedUS$2.16Low US$1.85

1st EditionUS$2.66Low US$1.86

As of Nov 10, 2026 · The market price is TCGplayer’s, in US dollars. It is a guide, not an offer.

Card details

Type: Effect Monster
Level: 3
Attribute: WATER
Monster type: Aqua
ATK: 500
DEF: 1,100

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.

About this card

King of the Swamp is card FUEN-EN040 in Fusion Enforcers, a Yu-Gi-Oh! set released Feb 24, 2017. Rarity: Super Rare. Finishes: Unlimited, 1st Edition. Reference market price on Nov 10, 2026: US$2.16 (Unlimited), US$2.66 (1st Edition). Over the last 30 days, the Unlimited price went down 15.6%. Source: TCGplayer market data via tcgcsv.com, updated daily. A reference price is not an offer.