Armored Shark (ROTA-EN003) - Rage of the Abyss 1st Edition

(This card is always treated as an "Armored Xyz" card.)
You can send 1 WATER Xyz Monster from your Extra Deck to the GY, then target 1 Fish monster in your GY with the same Level as the Rank of that monster; Special Summon it. During your opponent's turn, if this card is in your GY (Quick Effect): You can target 1 WATER Xyz Monster you control; equip this card to that monster as an Equip Spell that gives it 500 ATK. You can only use each effect of "Armored Shark" once per turn.