Destiny HERO - Dynatag

During damage calculation, when you would take battle damage (Quick Effect): You can discard this card; make yourself take no battle damage from that battle, and if you do, each player takes 1000 damage. You can banish this card from your GY, then target 1 "Destiny HERO" monster you control; it gains 1000 ATK until the end of your opponent's next turn.