Wailing Woods

{t}: Add {g}
{x}{g}{g}{g}: X must be equal to the number of creatures you control. Build a Skybase artifact token with, Tap a Creature: Put a wood counter on the Skybase
Remove 3 wood counters from Skybase: Put a Sky counter on the Skybase
Remove 3 Sky counters from the Skybase: Creatures you control gain flying and have indestructible as long as they have flying. Deal 3 damage to all creatures without flying.