Effect
3 Level 4 Warrior-Type monsters Once per turn, during either player's turn, when a Trap Card is activated: You can detach 1 Xyz Material from this card; negate the activation, and if you do, destroy it, then this card gains 500 ATK.
The monster effect of "Heroic Champion - Kusanagi" is a Quick Effect. (It can be activated during the Damage Step.)
This effect does not target. It is an effect that is activated by chaining directly to the activation of a Trap Card activated by you or your opponent. (It cannot be activated by chaining to the activation of a Trap Card's effect.)
When activating the effect, detach 1 Xyz Material from this card as a cost.
The effect "negate the activation, and if you do, destroy it" and the effect "then, this card gains 500 ATK" are not treated as occurring simultaneously.
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