Effect
When a face-up "Gagaga" monster(s) you control is targeted by the effect of an opponent's monster: Negate the effect of that opponent's monster, and if you do, destroy it, then inflict damage to your opponent equal to the destroyed monster's ATK or DEF in the Graveyard (whichever is higher).
This effect does not target. It is activated by chaining directly to the activation of an opponent's monster effect that targets a face-up "Gagaga" monster in your Monster Zone.
This effect cannot be activated during the Damage Step.
The effect "negate that opponent's monster's effect and destroy it" and the effect "then, inflict damage to your opponent equal to the higher of the destroyed monster's ATK or DEF" are not treated as occurring at the same time.
The damage inflicted to your opponent is equal to the higher of the original ATK or original DEF of the monster destroyed by the effect of "Gagaga Rush". (If a monster with 0 or ? original ATK is destroyed, the damage inflicted to your opponent's LP will result in 0.)
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