Cat army

This creature can't leave the battlefield.
first strike, vigilance.
Other cats you control have vigilance.
{x}{w}{w}; create X 1/1 white cat creature tokens
with lifelink.
When cat army enters the battlefield, create 2 1/1
white cat creature tokens with lifelink. You gain
5 life.
Cat army's power is equal to the number of cats
you control.