Effect
Equip only to a "Mermail" monster. It gains 400 ATK. When a monster effect that was activated on your opponent's side of the field resolves, negate that effect, then send this card to the Graveyard.
[Regarding "Can only be equipped to a 'Mermail' monster"]
This is not treated as an effect. It is a condition for which monster this card can be equipped to.
You can activate this card by targeting 1 face-up "Mermail" monster in your Monster Zone.
【Regarding the effect "The equipped monster gains 400 ATK"】
This is an effect that does not start a Chain Link, applied by this card while it is face-up in the Spell & Trap Zone.
This is an effect applied to the equipped monster.
Regarding the effect "As long as this card remains face-up on the field, negate the effects of Effect Monsters activated on your opponent's field. Then, send this card to the Graveyard": * This is an effect that does not start a Chain Link, applied by this card while it is face-up in the Spell & Trap Zone. * While this effect is being applied, if your opponent performs the resolution of an Effect Monster's effect activated in the Monster Zone, that first instance is negated by this effect. * This effect is also applied during the Damage Step.
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