Tengu format ruling
De-Fusion
Card effect (current official text)Target 1 Fusion Monster on the field; return that target to the Extra Deck, then, if all the Fusion Materials that were used for its Fusion Summon are in your GY, you can Special Summon all of them.
Rulings
- If you have only 1 of the Fusion Material Monsters in your GY you cannot Special Summon it.
- You may use De-Fusion to Special Summon Goddess with the Third Eye or King of the Swamps if it was used as a Fusion Material Monster for the Fusion Monster selected with De-Fusion.
- After you attack with a Fusion Monster, you may activate De-Fusion in the End Step of the Battle Phase to Special Summon the appropriate Fusion Material Monsters and attack with them in the same Battle Phase.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.