1. Declaration of Attack:
* The Paladin of the White Dragon player declares an attack targeting a face-down monster on the opponent's field.
2. Activation of Magical Arms Shield:
* The opponent, upon the attack declaration, can choose to activate Magical Arms Shield.
* Magical Arms Shield's effect negates the attack of the monster it's equipped to.
3. The Result:
* The attack of the Paladin of the White Dragon is negated.
* The monster equipped with Magical Arms Shield remains face-down.
* The Paladin of the White Dragon cannot attack this monster this turn.
Important Notes:
* No Damage: Since the attack is negated, no damage is dealt to the opponent's Life Points.
* No Flip: Magical Arms Shield only negates the attack, it does not force the monster to flip face-up.
* Chain Link: If another card or effect activates in response to the attack declaration (before Magical Arms Shield), it will be chained in the order of activation.
In conclusion: Magical Arms Shield effectively protects the equipped monster from the Paladin of the White Dragon's attack, negating it and ensuring the monster remains face-down.