Assault Blackwing - Kusanagi the Gathering Storm

1 Tuner + 1+ non-Tuners
If this card is Synchro Summoned using a "Blackwing" monster as material, it is treated as a Tuner while face-up on the field. After this card is Synchro Summoned, it gains ATK equal to the total original ATK of the Synchro Monsters used as material, until the end of this turn. Can attack all your opponent's monsters, once each. If this card attacks a Defense Position monster, inflict piercing battle damage to your opponent.