Effect
Target 1 Rank 4 Xyz Monster you control; equip this card to that target. It gains 300 ATK for each Xyz Material attached to it. Once per turn, while this card is equipped to a monster by this effect: You can attach 1 "Bujin" monster from your hand to the equipped monster as an Xyz Material.
"Bujin Regalia - The Sword" targets 1 Rank 4 Xyz Monster you control face-up.
You cannot activate the effect that allows you to "attach 1 'Bujin' monster from your hand to the equipped monster as an Xyz Material" in the same chain block as the activation of the "Bujin Regalia - The Sword" card itself.
The activation of the "Bujin Regalia - The Sword" card can be performed during the Damage Step, but not during damage calculation. Furthermore, the effect that allows you to "attach 1 'Bujin' monster from your hand to the equipped monster as an Xyz Material" cannot be activated during the Damage Step.
If one Xyz Monster is equipped with multiple copies of "Bujin Regalia - The Sword," the effect that increases its ATK by "300 for each Xyz Material attached to that monster" is applied for each copy, and its ATK increases accordingly.
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