Tengu format ruling
Revoke Fusion
Card effect (current official text)Discard 1 "Polymerization" to the Graveyard. Send 1 Fusion Monster from your Extra Deck to your Graveyard and Special Summon 1 monster from your hand that is listed as a Fusion Material Monster on that card. The Special Summoned monster is sent to the Graveyard during the End Phase of this turn.
Rulings
- Fusion Monsters that are not Fusion Summoned with Polymerization (XYZ-Dragon Cannon, etc.) can be selected with Revoke Fusion and you can Special Summon 1 of the Fusion Material Monsters listed on the Fusion Monster.
- You cannot Special Summon a Fusion Material Monster that is not specified by name. Example: You cannot select Chimeratech Overdragon with Revoke Fusion and Special Summon a Blowback Dragon, but you can Special Summon a Cyber Dragon.
- Fusion Monsters that do not specify any Fusion Material Monsters by name (Five-Headed Dragon, etc.) cannot be selected with Revoke Fusion.
- You cannot select a Fusion Monster that does not list any Fusion Material Monsters you can Special Summon. Example: You cannot select Dragon Master Knight because you cannot Special Summon Black Luster Soldier or Blue-Eyes Ultimate Dragon from your hand.
- You cannot activate Revoke Fusion if there are no monsters in your hand that you can Special Summon
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.