Reincarnation Unveiling 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 card equipped to this card to the hand, then immediately after this effect resolves, Xyz Summon 1 WATER Xyz 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 Unveiling Mail" per turn.