Must be Synchro Summoned.
(1) Once per turn, when another card or effect is activated (Quick Effect): You can negate the activation, and if you do, destroy that card, and if it was a monster, this card gains ATK equal to that monster’s original ATK until the end of this turn.
(2) If this face-up Synchro Summoned card leaves the field by your opponent: You can Special Summon 1 “Clear Wing” monster from your Extra Deck.