Black Whirlwind

Edison Card Text
① 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 on the field.
No targeting
No Damage Step effect
Banlist • Semi-Limited
Rulings
edisonformat.net
● If that monster isn’t face-up on the field when this effect resolves, no card is searched.
● If you control this card, and have a "Blackwing" monster in your Deck with less than 1300 ATK:
When you Summon "Blackwing - Blizzard the Far North", both its effect and "Black Whirlwind" will trigger. Since they are both optional effects, you can order them in any way you like.
If you order them as: Blizzard Chain Link 1, Whirlwind Chain Link 2, then your opponent can only respond to the newest chain link - Black Whirlwind's effect.
This means that cards like "Royal Oppression" and "Pulling the Rug" can't be activated at this time - Those cards can't be chained to Black Whirlwind's effect.
edisonformat.com
When a “Blackwing” monster is Normal Summoned to your side of the Field, you can add 1 “Blackwing” monster from your Deck to your hand that has less ATK than that monster.
This optional Trigger-like Effect activates in the Summon response timing.
Both "Black Whirlwind" and the Normal Summoned "Blackwing" monster must be face-up on the field.
This effect still resolves if control of the "Blackwing" monster changes during the chain.
The ATK (+ATK modifiers) of the "Blackwing" monster is assessed when resolving this effect.
A chain can be built if multiple copies of "Black Whirlwing" were triggered simultaneously.