Mermail Abyssnerei (CIBR-EN028) - Circuit Break Unlimited

(Quick Effect): You can discard this card, then target 1 WATER monster you control; destroy 1 other WATER monster in your hand or field, and if you do, the targeted monster gains ATK/DEF equal to the destroyed monster's original ATK/DEF, until the end of this turn. If this card is sent from the field to the GY: You can draw 1 card, then discard 1 card. You can only use each effect of "Mermail Abyssnerei" once per turn.