Is Treacherous Pit-Dweller legal in Standard, Modern, and Commander?

Treacherous Pit-Dweller is legal in: Modern, Legacy, Vintage, Commander.

Treacherous Pit-Dweller

Q: What type of card is Treacherous Pit-Dweller?

Treacherous Pit-Dweller is a Creature — Demon. Its oracle text reads: "When this creature enters from a graveyard, target opponent gains control of it. Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)"

Creature — Demon

When this creature enters from a graveyard, target opponent gains control of it.

Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

Set Avacyn Restored

Rarity Rare

Mana Value 2

Artist Svetlin Velinov

Collector # 121

Scryfall Gatherer