King of the Swamp | Deck and Rulings

This page notes details of King of the Swamp (WATER/Aqua/Effect Monster) : decks, tips, effect and rulings. Learn and enjoy playing Yu-Gi-Oh! Duel Links!
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update 30/11/2016

King of the Swamp

King of the Swamp
Monster TypeAqua
Card typeEffect
Card Effect TypeUnclassified Effect / Ignition Effect
SupportsPolymerization / Fusion Monster
Related to ArchetypesPolymerization


You can substitute this card for any 1 Fusion Material Monster, but the other Fusion Material Monster(s) must be correct. You can discard this card to the Graveyard: Add 1 "Polymerization" from your Deck to your hand.

How to get / rarity

PackGeneration Next [UR]
Level-up reward--
Victory against--
Card trader--




  • This card can be used as a substitute to a Fusion Material Monster.
  • It can add Polymerization from you deck to your hand.


  • Stats are low which makes it unreliable in battle and easy target of attacks.
  • The other card to be used for the Fusion Summon with this card must be correct.
  • You must discard this card from your hand to get Polymerization from your Deck to your Hand.



King of the Swamp's 2 effects gives you versatility that is very useful on Fusion Decks. It lets you search Polymerization from your Deck or use it as a substitute to Fusion Material Monsters.


By using these cards you can get King of the Swamp that was used for Fusion from your Graveyard back to your Hand.

Fusion Monsters

These 2 cards are currently the two best Fusion Monsters in the game right now. Use King of the Swamp in decks the revolves around with these cards.

Elemental Hero

You can also use King of the Swamp on Elemental-Hero decks since Elemental-Hero cards focuses on Fusion Summons.

Frost and Flame Dragon

Since King of the Swamp is a WATER attribute monster, you can include Frost and Flame Dragon to fusion decks the uses FIRE attribute monsters.



ActionsDiscards itself for cost / Adds from Deck to hand
Summoning categoriesFusion Substitute Monster


Hot New Top
Anonymous 21days ago
Awesome card but... it should be SR lol
I found a card related to this dude.
<< Anonymous
Anonymous 22days ago Reply
reminds me of another card called ' contract with the dark master'
This one should be a SR card n.n
<< Anonymous
Anonymous Reply
Nah, it's definitely good enough to be UR. Fusion Sage, on the other hand, should have been SR or R from the get go.
<< Anonymous
Anonymous Reply
I mean it has two effects, definitely UR considering you have many ways to poly or get poly
can't make E-hero Tempest...
Wish this card would be just a SR, it's not that great... it's even useful in farming decks.
Is there a card comming how is better for a fusion deck? Im really considering to buy this pack. But maybe it would be a waste if there will be a futue pack that would be better.
<< Anonymous(Stanley)
Anonymous Reply
There is no other card that does what King of the Swamp does. (Be both a Polymerization and a Fusion sub.)

As just general Fusion support... I doubt we'll get anything that makes King of the Swamp obsolete any time soon. Unless they release Keeper of Dragonic Magic, but King's versatile enough that even that wouldn't likely make King of the Swamp not worth using.
Anonymous No. 2
Was this card erratad?
Because the text in the above picture does not contain the words "... whose name is specifically listed", while the additional text is present in the game version of the card and on sites like yugiohwiki.
It might seem like a small difference, but it's really not. It means that it can't replace a generic fusion material, only specific monster material listed on the fusion monster.
<< Anonymous(Anonymous No. 2)
Anonymous Reply
Fusion substitutes have always only been able to replace named materials. No wording change has ever changed the functionality of any of them.

Never in the history of the game have you been able to, for example, use King of the Swamp as one of the Dragons for Five-Headed Dragon, unless it's a Dragon-Type itself.
I think this one should be just a SR :v
<< Anonymous(^^)
Anonymous Reply
lol I've been thinking about the same bruh
<< Anonymous
f2p player Reply
yeah.. very expensive!!

But i like playing with extra deck... all-in and have 3 copies of it.

No regret!! now i can have fusion & synchro monsters in my extra deck!
a bit expensive.
This dude shouldn't be a UR card :D
well, I don't think he should, because his usage is mostly in farming decks lol ^^

Anyway, I've farmed all the characters without him, so I can't really complain... im just saiyan
3rd rate duelist
Does nobody care about the artwork? Like is he shooting a laser from his head or he got shoot to the head? If he shoot laser, what he shoot at? The moon? And what's up with his hands? Did his hand broke? And is it he or she?
<< Anonymous(3rd rate duelist)
Anonymous Reply
welcome to yugioh
<< Anonymous(3rd rate duelist)
Anonymous Reply
It is he since it a "king"
Just got my 3th one in the Selection Box <3
<< Anonymous
SPAG Police Reply
3th? Really

Commens and feedback




Comments (updated every hour)

I hope they add more worlds to duel links that would be cool
fabled, any light deck, use your imagination...
I got it pretty early in the box, pulled about 2 UR every 10 packs too.
konami are killing the game off on purpose, they wanna start from scratch and have people buy all...
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