A lot has changed since King of the Swamp was previously reviewed. The first time made the card seem great since Polymerization could get big monsters to the field. The second time was just before Star Wars Episode 3 came out. Then, there was Magical Scientist and Metamorphosis. Now, there are Instant Fusion and theme specific fusion cards. Since King of the Swamp can only tutor Polymerization, it's only real utility is in decks that run that card. Maybe Lunalights? I'd pay 1500 Life points and discard King of the Swamp if they fixed the text to say Polymerization or any Fusion card. As it stands, King of the Swamp is only King of the Fusion Substitute monsters. Versatility is worth something. Particularly note worthy is the card is a Fusion Substitute in the grave such that both effects can be used in the same turn, though not with Polymerization. Because Polymerization is bad. It's as bad as Ritual Monsters use to be and for about the same reason. No monster was really worth all the effort to lose all those resources from the hand or field. Dark Paladin is still cool though. Run this in an old school fun deck. Use any Fusion Substitute in current decks. 
 
Score: 2.5/5 Consider Performapal Trump Witch.
Art: 3/5 Monsters with frickin' lasers on their heads!
 
-WarlockBlitz