Reincarnation Unvealing Mail

(This card is always treated as an "Armored Xyz" card.)
An Xyz Monster equipped with this card gains these effects.
●Cannot be destroyed by battle.
●Once per turn, if this card battled this turn (Quick Effect): You can return 1 Equip Card equipped to this card to the hand, then, immediately after this effect resolves, Xyz Summon 1 WATER monster.
Once per turn, during the End Phase, if this card is in the GY because it was sent there this turn: You can equip this card to 1 Xyz Monster you control. You can only activate 1 "Reincarnation Unvealing Mail" per turn.