REDU format ruling
Spirit of the Six Samurai

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Once per turn, you can either: Target 1 face-up "Six Samurai" monster you control; equip this card to that target, OR: Unequip this card and Special Summon it in face-up Attack Position. While equipped by this effect, the equipped monster gains 500 ATK and DEF. If the equipped monster destroys an opponent's monster by battle: Draw 1 card. (A monster can only be equipped with 1 Union Monster at a time. If the equipped monster would be destroyed, destroy this card instead.)
Rulings
(1) Once per turn, you can equip this card to a Six Samurai monster you control, OR unequip it to Special Summon this card in face-up Attack Position. (2) When equipped to a monster by this card's effect, that monster gains 500 ATK and DEF. (3) When the equipped monster destroys an opponent's monster by battle, draw 1 card. (C) (A monster can only be equipped with 1 Union Monster at a time. If the equipped monster would be destroyed, this card is destroyed instead.)
- The effect of "Spirit of the Six Samurai" that activates when the equipped "Six Samurai" monster destroys a monster in battle begins a Chain at the time when the destroyed monster is sent to the GY.
- If a "Six Samurai" monster is equipped with "Legendary Ebon Steed" and "Spirit of the Six Samurai", when the equipped "Six Samurai" monster would be destroyed both the "Legendary Ebon Steed" and "Spirit of the Six Samurai" are destroyed instead.
- If both Spirit of the Six Samurai and the equipped Six Samurai monster are destroyed by the same effect, the Spirit of the Six Samurai's effect is not applied.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.