Black-Winged Assault Dragon [MP23-EN187] Prismatic Secret Rare

1 Tuner Synchro Monster + 1+ non-Tuner monsters Must be either Synchro Summoned, or Special Summoned from your Extra Deck by banishing 1 Tuner Synchro Monster and 1 "Black-Winged Dragon" from your face-up field and/or GY. Each time your opponent activates a monster effect, place 1 Black Feather Counter on this card when that effect resolves, and if you do, inflict 700 damage to your opponent. During your opponent's turn (Quick Effect): You can Tribute this card with 4 or more Black Feather Counters on it; destroy all cards on the field.