Hangarback Walker - Proxy

Hangarback Walker enters the battlefield
with X +1/+1 counters on it.
When Hangarback Walker dies, put a 1/1
colorless Thopter artifact creature token
with flying onto the battlefield for each
+1/+1 counter on Hangarback Walker.
{1}, {t}: Put a +1/+1 counter on Hangarback
Walker.