Nesting Knight

Flying, Vigilance
{w}{w}{w}:Put a +0/+2 counter on target creature with power 2 or less.
{w}{w}{w}{t}:All creatures you control that have at least one +0/+2 counter on them gain Vigilance until end of turn.
{w}{w}{t}{x}:Sacrifice Nesting Knight, put X 1/1 Bird tokens with Flying and Vigilance onto the battlefield under your control.