Is Hangarback Walker legal in Standard, Modern, and Commander?

Hangarback Walker is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Hangarback Walker

Q: What type of card is Hangarback Walker?

Hangarback Walker is an Artifact Creature — Construct. Its oracle text reads: "This creature enters with X +1/+1 counters on it. When this creature dies, create a 1/1 colorless Thopter artifact creature token with flying for each +1/+1 counter on this creature. {1}, {T}: Put a +1/+1 counter on this creature."