REDU format ruling
De-Fusion
Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
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
- Special Summoning the Fusion Material Monsters is an option. So you may use De-Fusion to return a Fusion Monster to its owner’s Extra Deck even if you have only 1 or none of the appropriate Fusion Material Monsters in your GY.
- 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.
- If you activate De-Fusion and select a Fusion Monster that was Special Summoned by Magical Scientist or Metamorphosis you can return the Fusion Monster to the owner’s Extra Deck, but cannot Special Summon any Fusion Material Monsters since none were used.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.