Mechagodzilla Battle Fortress Hangarback Walker Welcome Back Promo

“Hangarback Walker enters the battlefield with X +1/+1 counters on it. <br>When Hangarback Walker dies, create a 1/1 colorless Thopter artifact creature token with flying for each +1/+1 counter on Hangarback Walker. <br>1, T: Put a +1/+1 counter on Hangarback Walker.”