Moon mirror shield Crossed souls

Moon mirror shield equip spell card
If the equipped monster battles an opponent’s monster, during damage calculation: The equipped monster’s ATK and DEF become equal to the ATK or DEF (whichever is higher) of the opponent’s battling monster +100, during damage calculation only. If this face-up card is sent from the field to the Graveyard: Pay 500 LP; place this card on either the top or bottom of your Deck.

It's good card because it makes the level 3 charmers beat sticks. It's good for any deck that runs low ATK monsters that has a good effect when they infect battle damage like the dark scorpions. I know the graveyard effect is not optional but it's not that big of a deal. So what do you think about moon mirror shield?

Didn't see it being useful TBH, it can be good, but if we're talking about meta play, can't see them happens