CG Rulings Sending an Equip Spell to the Graveyard is a cost.[1]

The effect targets 1-3 monsters in your opponent's Graveyard.[1]

Removing from play the monsters and increasing this card's ATK happen at the same time.[1]

Even if 1 of the target monsters leaves the Graveyard before this effect resolves, the remaining targets will be removed from play and this card's ATK will be increased appropriately.[1]

You can send an opponent's Equip Spell equipped to this card to the Graveyard as a cost.[1]