Active Guard

Effect: This card gains 500 DEF for each Armor monster that you control. If you would receive any damage during your turn, you can reduce the damage to 0. This card is destroyed the turn this effect is used, during the End Phase. (Only 1 Armor monster can attack per turn. If you control 2 or more Armor Monsters, and 1 is declared as an attack target, you can change the target to another Armor monster you control.) Rulings

Rulings

 * When Dark Arena is on the field, the effect of Armor monsters that only one can attack per turn is still applied.
 * 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.