Harpie's Pet Phantasmal Dragon [MAGO-EN132] Rare 2015 Mega-Tins but when it does so

but when it does so using this effect

Set: Spell Ruler Card type: Field Spell Rarity: Common Increase the ATK of all WIND monsters by 500 points and decreases their DEF by 400 points

and equip 1 of your opponent's monsters whith this card

Set: Dark Beginning 2 Card type: Effect Monster Rarity: Rare Attack: 700 Defense: 600 FLIP: Both you and your opponent discard all cards in your hands

Harpie's Pet Phantasmal Dragon [MAGO-EN132] Rare 2015 Mega-Tins but when it does soSet: Maximum Gold Card type: Xyz Effect Monster Rarity: Rare Attack: 2000 Defense: 2500 3 Level 4 WIND monsters This card's effects can only be applied resolved while it has Xyz Material. This card can attack your opponent directly. Your opponent cannot target any "Harpie" monsters with effects or for attacks. During each of your End Phases: Detach 1 Xyz Material from this card.