Moon Mirror Shield — Ruling

Effetto 1

This card's effect that changes the equipped monster's ATK/DEF is an activated effect. (It does not target.)
This card's effect that changes the equipped monster's ATK/DEF must be activated any time the equipped monster battles an opponent's monster. (It does not apply at the time Moon Mirror Shield is equipped to the monster.)

This card's effect that returns it to the Deck is an activated effect, which is activated in the Graveyard. (It does not target. To activate this effect, pay 500 Life Points as a cost. When the effect resolves, you can choose whether to return Moon Mirror Shield to the top or the bottom of your Deck.)
This card's effect that returns it to the Deck must be activated if this face-up card is sent from the field to the Graveyard. (It must also be activated during the Damage Step. If you have 500 or more Life Points, you will be required to pay 500 Life Points to activate the effect. If you have less than 500 Life Points, you cannot pay the required cost, so the effect will not be activated.)