Card Rulings:Fusion Substitute Monster

The following rulings apply to all Fusion Substitute Monsters.

===OCG Rulings===
 * The effect of "Supply" can also return Fusion Substitute Monsters like "King of the Swamp" to your hand.


 * You cannot use Fusion Substitute Monsters like "Goddess with the Third Eye" with "Future Fusion", since Fusion Substitute Monsters have no effect while in the deck.


 * You cannot use Fusion Substitute Monsters like "Goddess with the Third Eye" when Fusion Summoning "Elemental HERO Absolute Zero". However, "Beastking of the Swamps" and "King of the Swamp" are WATER-Attribute Monsters, so they can be used as normal.


 * When Fusion Summoning a monster like "Dark Balter the Terrible" or "Cyber End Dragon" or "Destiny End Dragoon", you must use the Fusion Material Monsters that are specifically listed on the card. You cannot use a Fusion Substitute Monster like  "Goddess with the Third Eye" or "King of the Swamp" as a Fusion Material Monster.


 * When Special Summoning "Gem-Knight Ruby" from the Extra Deck, you can only use the Fusion Materials which are written on the card. You cannot use "Goddess with the Third Eye" as a Fusion Material.


 * The effect "You can substitute this card for any 1 Fusion Material monster." of monsters like "King of the Swamp" is not applied while the monster is banished, so if you activate "Parallel World Fusion", then you cannot use Fusion Substitute Monsters.


 * If you use a monster like "King of the Swamp" in place of "Elemental Hero Neos" when Fusion Summoning "Elemental HERO Neos Knight", then the ATK of "Elemental HERO Neos Knight" only increases by half the ATK of the Warrior-Type monster.
 * Example: If you use "Marauding Captain" (1200 ATK) and "King of the Swamp" to Fusion Summon "Elemental HERO Neos Knight", then "Elemental HERO Neos Knight" will only have 3100 ATK.


 * This card's effect which allows it to be substituted for a Fusion Material Monster does not have a classification. It is neither a Flip Effect nor an Continuous Effect nor an Ignition Effect nor a Trigger Effect nor a Quick Effect.

Mentions in Other Rulings

 * Dark Fusion: When resolving "Dark Fusion", you can use a card like "King of the Swamp" as a substitute Fusion Material. However, if you are Fusion Summoning a Fusion Monster like "Evil Hero Dark Gaia" which does not specifically name cards (it specifies "1 Fiend-Type monster + 1 Rock-Type monster"), or a monster like "Dark Balter the Terrible" with the text "A Fusion Summon of this monster can only be conducted with the above Fusion Material Monsters", then you cannot use a monster like "King of the Swamp".


 * Gem-Knight Ruby: The text "This monster can only be Special Summoned by Fusion Summon (from the Extra Deck) using the above cards as Fusion Material Monsters" of cards like "Gem-Knight Ruby" also prevents you from Fusion Summoning it from the Extra Deck by using a monster with an effect like that of "King of the Swamp" as a Fusion Material Monster.

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.


 * Chimeratech Overdragon: When you Fusion Summon this card you can use a substitute, such as "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.


 * Cyberdark Impact: You cannot use Fusion substitute monster like "Goddess with the Third Eye" with this card.


 * Dark Balter the Terrible: The first sentence of this card's text means that monsters such as "Beastking of the Swamps" cannot be used as a substitute for one of the required Fusion Material Monsters. You CAN use the effect of "Magical Scientist" or "Summoner of Illusions" to Special Summon this card like any other Fusion Monster.


 * Dark Paladin: You can use "substitute" Fusion Material Monsters such as "Goddess with the Third Eye", etc. to Fusion Summon "Dark Paladin".


 * De-Fusion: You may use "De-Fusion" to Special Summon "Goddess with the Third Eye" or "King of the Swamp" if it was used as a Fusion Material Monster for the Fusion Monster selected with "De-Fusion".


 * Dragon's Mirror: You can use fusion substitute monsters like "King of the Swamp" and "Goddess with the Third Eye" for "Dragon's Mirror".


 * Fiend Skull Dragon: You cannot use substitute Fusion Material Monsters such as "Beastking of the Swamps" to Fusion Summon this card. You can use the effects of "Metamorphosis", "Magical Scientist", and "Summoner of Illusions" to Special Summon this card.


 * Fusion Recovery: You can use "Fusion Recovery" to retrieve a fusion substitute monster like "King of the Swamp" or "Goddess with the Third Eye" 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.


 * Miracle Fusion: You can use fusion substitute monsters like "King of the Swamp" and "Goddess with the Third Eye" for "Miracle Fusion".


 * Prohibition: If a Fusion Substitute Monster like "King of the Swamp" is declared by "Prohibition", it cannot be used as a Fusion Material substitute in a Fusion Summon while it is in your hand.


 * VWXYZ: You must remove from play the monsters specified; you cannot use "Goddess with the Third Eye", etc., because you are not performing a Fusion Summon.

Judge List Rulings

 * Overload Fusion: You can use fusion substitute monsters like “King of the Swamp” and “Goddess with the Third Eye” for “Overload Fusion”.