Summon a Blackwing monster with higher attack than Blackwing - Damascus the Polar Night so that you can use Black Whirlwind to search him from your deck. You can then discard Damascus the Polar Night when the monster you summoned battles.
Blackwing - Damascus the Polar Night helps load your graveyard with Blackwing monsters so that you can use Blackwing Backlash to destroy all your opponent’s monsters.
Discards itself for cost
Your monsters gain ATK
I'll be honest. This isn't that impressive to me. We already saw something like this with D-hero Blade Master, who did it stronger, and who to this day barely sees play in its archetype. I don't see anything different happening with Damascus.