Elya, the Hidden Weapon

Elya, the Hidden Weapon enters the battlefield
with five cage counters on her and has shroud.
Elya and Spirits you control cannot attack or
block as long as she has a cage counter.
At the beginning of your end step create X 1/1
white Spirit creature tokens with flying where
X is the number of cage counters on Elya then
remove a cage counter from Elya. When Elya
leaves the battlefield, destroy all spirits.