Goat format ruling
King of the Swamp
Card effect (current official 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.
Rulings
- You can only get 1 copy of Polymerization when you discard King of the Swamp from your hand.
- You can activate the effect of King of the Swamp even if all 3 of your Polymerization cards are in your GY.
- If King of the Swamp is selected for the effect of Prohibition, you cannot use either of its effects.
- Discarding this card is a cost.
- If you use King of the Swamp as Fusion Material from your hand, you do not get to activate its effect to search your Deck for Polymerization.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Goat forum — sourced change requests get reviewed.