Effect
Monsters cannot attack face-down Defense Position monsters, but can attack directly if all monsters their opponent controls are face-down Defense Position. Your opponent takes no damage. When an opponent's monster declares a direct attack: You can add 1 "Ghostrick" card from your Deck to your hand.
The effect "You can add 1 'Ghostrick' card from your Deck to your hand" is an optional effect that is activated when an opponent's monster declares a direct attack, and it creates a Chain Link. (Only the controller of "Ghostrick Parade" can activate this effect.)
While the effect of "Ghostrick Parade" is being applied, all damage dealt to the player who is the opponent of the "Ghostrick Parade" controller becomes 0. (Both battle damage and effect damage become 0.)
The effect "all damage dealt to the opponent player becomes 0" does not create a Chain Link. Furthermore, it is not an effect that affects monsters.
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