Crystal Wing Synchro Dragon (Quarter Century Secret Rare) [RA02-EN029] Quarter Century Secret Rare

1 Tuner + 1+ non-Tuner Synchro Monsters Once per turn, when another monster's effect is activated (Quick Effect): You can negate the activation, and if you do, destroy that monster, and if you do that, this card gains ATK equal to the destroyed monster's original ATK until the end of this turn. If this card battles an opponent's Level 5 or higher monster, during damage calculation: This card gains ATK equal to the current ATK of the opponent's monster it is battling during that damage calculation only.