Edison format ruling
The Six Samurai - Irou

Card effect (current official text)At the start of the Damage Step, if this card attacked a face-down Defense Position monster: Destroy that monster. You must control a face-up "Six Samurai" monster with a different name to activate and to resolve this effect. If this card would be destroyed, you can destroy another face-up "Six Samurai" monster you control instead.
Rulings
(1) While you control another Six Samurai monster with a different name, if this card attacks a face-down Defense Position monster, destroy the monster immediately with this card's effect without flipping it face-up or applying damage calculation. (2) If this card would be destroyed, you can destroy another Six Samurai monster you control instead.
- The (1) mandatory Trigger Effect activates & resolves on the field.
- This effect activates in Substep 1 - Start of the Damage Step, before the Set monster if revealed.
- This effect only activates if you control another Six Samurai monster with a different name.
- The (2) Continuous Effect does not activate, it applies while the destruction occurs.
- This effect does not target.
- You cannot destroy a face-down Six Samurai monster instead.
- You can apply this effect when an effect that destroys this card resolves (ex: Call of the Haunted).
- Your other Six Samurai is considered destroyed by this effect, not by battle / card effect.
- Example: If "Ring of Destruction" targets a "Six Samurai" monster, and you destroy a different "Six Samurai" monster instead, zero damage will be inflicted by "Ring of Destruction".
- You can apply this effect in Substep 4 - Damage Calculation. The "Six Samurai" that you destroy instead is sent to the GY in Substep 7 - End of the Damage Step.
- If multiple Six Samurai would be destroyed at once, you can destroy 1 other Six Samurai for each you wish to protect. You cannot only destroy 1 "Six Samurai" to protect all the others.
- Example: If Mirror Force would destroy 2 of your Six Samurai monsters, you must destroy 2 Defense Position Six Samurai monsters to save those two
- Example: If Mirror Force would destroy all your face-up Six Samurai monsters, you cannot destroy any of them as substitutes.
- If you control 2 "Six Samurai" monsters, and 1 of them equipped with "Legendary Ebon Steed" would be destroyed, the effect of "Legendary Ebon Steed" must be used. You cannot choose to destroy another "Six Samurai" monster instead.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.