REDU format ruling
Branch!

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)When a Fusion Monster(s) on the field is destroyed by battle or card effect and sent to the Graveyard: You can target 1 of the Fusion Materials in your Graveyard that was used for its Fusion Summon; Special Summon it.
Rulings
- The effect of "Branch!" can be chained to.
- All of the Fusion Material Monsters do not need to be in the GY in order to use the effect of "Branch!". As long as 1 of the monsters used for the Fusion Summon is in the GY, it can be Special Summoned.
- The Fusion Material Monster can still be Special Summoned with "Branch!" even if it has been Special Summoned by another effect and then sent back to the GY, or even if it was removed from play and returned to the GY.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.