Hangarback Walker enters the battlefield with X +1/+1 counters on it.
When Hangarback Walker dies, create a 1/1 colorless Thopter artifact creature token with
flying (This creature can't be blocked except by creatures with flying or reach.) for each +1/+1 counter on Hangarback Walker.
,
: Put a +1/+1 counter on Hangarback Walker.