Is Hound of Griselbrand legal in Standard, Modern, and Commander?

Hound of Griselbrand is legal in: Modern, Legacy, Vintage, Commander.

Hound of Griselbrand

Q: What type of card is Hound of Griselbrand?

Hound of Griselbrand is a Creature — Elemental Dog. Its oracle text reads: "Double strike 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.) Power/Toughness: 2/2"

Creature — Elemental Dog

Double strike

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.)

Power/Toughness: 2/2

Set Avacyn Restored

Rarity Rare

Mana Value 4

Artist Svetlin Velinov

Collector # 141

Scryfall