Advanced Shield

Effect: This card cannot be Summoned if you do not control an Armor monster. This card cannot declare an attack. (Only 1 Armor monster can attack per turn. If you control 2 or more Armor monster, and 1 of them is declared as an attack target, you can change the target to another Armor monster you control.)

Rulings

 * The effect allowing you to change the target of your opponents attack does not use the chain.
 * If the attack of an armor monster is negated, other armor monsters cannot attack.
 * The same armor monster may attack multiple times in a turn if a card effect allows it to.