Card Rulings:King of the Swamp


 * 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 Graveyard.


 * 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".

Mentions in Other Rulings

 * Branch!: A Fusion Substitute Monster, such as "King of the Swamp", can be Special Summoned with "Branch!" if it was used in a Fusion Summon.


 * Centrifugal Field: Substitute Fusion Material Monsters like "King of the Swamp" cannot be Special Summoned with "Centrifugal Field" because they are not written on the Fusion Monster Card. However, if they were used as substitutes to Fusion Summon the Fusion Monster, you can still use "Centrifugal Field" to Special Summon the other Fusion Material monster(s) from the Fusion Summon.


 * Chimeratech Overdragon: When you Fusion Summon this card you can use..."King of the Swamp", for the "Cyber Dragon", but not for the Machine-Type monsters. That means you can use a maximum of 1 substitute monster in the Fusion Summon.


 * Fusion Recovery: You can use "Fusion Recovery" to retrieve a Fusion Substitute Monster like "King of the Swamp"...as long as it was used in a Fusion Summon.


 * Future Fusion: You cannot use substitute Fusion Material Monsters such as "King of the Swamp". You must use the monsters listed on the Fusion Monster Card.

OCG Rulings

 * If there's no [Fusion] in your deck, you CAN still discard this card from your hand to Graveyard, but, both you and your opponent must confirm it (or...you must reveal all cards left in your deck to your opponent).