Flurry of Wings — ruling 1

An “attacking creature” is one that has been declared as an attacker this combat, or one that was put onto the battlefield attacking this combat. Unless that creature leaves combat, it continues to be an attacking creature through the end of combat step, even if the player it was attacking has left the game, or the planeswalker it was attacking has left combat.

Flurry of Wings — ruling 2

Flurry of Wings counts the number of creatures that are attacking as it resolves. It doesn’t matter how many creatures were originally declared as attackers that turn. It also doesn’t matter who controls those creatures, or who or what they’re attacking.

Flurry of Wings — ruling 3

If Flurry of Wings is cast before attackers have been declared or after combat ends, it won’t do anything.

Flurry of Wings : règles, fonctionnement et interactions (MTG)

Flurry of Wings is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Create X 1/1 white Bird Soldier creature tokens with flying, where X is the number of attacking creatures.

How it works : Flurry of Wings

Original English text — Wizards of the Coast / Scryfall

#1May 1, 2009· Wizards of the Coast
An “attacking creature” is one that has been declared as an attacker this combat, or one that was put onto the battlefield attacking this combat. Unless that creature leaves combat, it continues to be an attacking creature through the end of combat step, even if the player it was attacking has left the game, or the planeswalker it was attacking has left combat.
No other card is named in this ruling.
#2May 1, 2009· Wizards of the Coast
Flurry of Wings counts the number of creatures that are attacking as it resolves. It doesn’t matter how many creatures were originally declared as attackers that turn. It also doesn’t matter who controls those creatures, or who or what they’re attacking.
No other card is named in this ruling.
#3May 1, 2009· Wizards of the Coast
If Flurry of Wings is cast before attackers have been declared or after combat ends, it won’t do anything.
No other card is named in this ruling.