When a monster your opponent controls activates its effect: You can send 1 face-up "Blackwing" monster you control to the GY; negate the activation, and if you do, destroy it, then, you can Special Summon 1 "Black-Winged Dragon" from your Extra Deck.
If you control a "Blackwing" Synchro Monster or "Black-Winged Dragon", you can activate this card from your hand.
Trap
Counter
