Destiny HERO - Dynatag

During damage calculation (in either player's turn) when you would take battle damage: 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 Graveyard, then target 1 "Destiny HERO" monster you control; it gains 1000 ATK until the end of your opponent's next turn.