During either player's Damage Step, when a face-up monster you control is attacking or being attacked: You can send this card from your hand to the Graveyard; that monster gains 300 ATK until the end of this turn.
How to Get / Rarity
Not yet released
This effect cannot be negated.
Small attack increase
You can easily bait enemies when you have no spell/trap cards on your field since they will not expect any resistance.