Axthris, the Rising Flock

Flying, Haste
Whenever Axthris, the Rising Flock attacks,
you may tap any number of untapped lands you control, if you do create X 1/1 blue Bird creature tokens with flying that are tapped and attacking,
where X is the number of lands you controlled
that were tapped this way.
The beating of its wings is enough to make a clearing
in the forest, and make the other birds angry.