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Flying, vigilance
Silverwing Squadron's power and toughness are each equal to the number of creatures you control.
Whenever Silverwing Squadron attacks, create a number of 2/2 white Knight creature tokens with vigilance equal to the number of opponents you have.
As long as Silverwing Squadron is on the battlefield, its ability will count itself, so it'll be at least 1/1.
In a multiplayer game, opponents who have left the game aren't counted by Silverwing Squadron's triggered ability.
The ability that defines Silverwing Squadron's power and toughness works in all zones, not just the battlefield.
