GFP2-EN117 * Mathmech Addition * Ultra Rare * Ghosts From the Past: The 2nd Haunting Legendary Duelists Soulburning Volcano but return that Equip Spell

but return that Equip Spell to the hand during the End Phase

return that face-up card to the hand

then you can change any number of face-down Defense Position "Shaddoll" monsters you control to face-up Defense Position

at the end of the Battle Phase: Return this card from the field to the hand

If this card is Special Summoned by the effect of "Dark Element"

GFP2-EN117 * Mathmech Addition * Ultra Rare * Ghosts From the Past: The 2nd Haunting Legendary Duelists Soulburning Volcano but return that Equip SpellYou can target 1 face up monster on the field; you cannot Special Summon monsters from the Extra Deck for the rest of this turn, except Cyberse monsters, also Special Summon this card from your hand (but it cannot attack this turn), and if you do, the targeted monster gains 1000 ATK until the end of this turn. You can only use this effect of "Mathmech Addition" once per turn.