Avenora Hatchery

Whenever a Hacrox creature enters the battlefield
under your control you may put an egg counter
on Avenora Hatchery.
{1}, Sacrifice Avenora Hatchery: Create X 2/1
green and white hacrox hatchling creature tokens
with flying and vigilance, where X is equal to the number of egg counters on Avenora Hatchling.