You can send this card from your hand or field to the GY; place 1 «Black Feather Whirlwind» from your Deck face-up in your Spell & Trap Zone. If a «Blackwing» Synchro Monster(s) or «Black-Winged Dragon» is Special Summoned to your field, while this card is in your GY (except during the Damage Step): You can banish this card, then target 1 «Blackwing» monster in your GY; add it to your hand, then take 700 damage. You can only use each effect of «Blackwing – Shamal the Sandstorm» once per turn.