Aven of the Deep Sky

Flying, Vigilance, Haste
{u}{w}: Create a 1/1 white and blue bird creature
token with flying.
{w}{w}{r}: Put a +1/+1 counter on each bird you
control.
{w}{u}{r}{r}: Untap all other attacking birds. After
this phase there is an additional combat phase. Activate this ability only during combat.