Advanced format ruling
Black Whirlwind
Card effect (current official text)When a "Blackwing" monster is Normal Summoned to your field: You can add 1 "Blackwing" monster from your Deck to your hand with less ATK than that monster.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.