Is Howlgeist legal in Standard, Modern, and Commander?

Howlgeist is legal in: Modern, Legacy, Vintage, Commander.

Howlgeist

Q: What type of card is Howlgeist?

Howlgeist is a Creature — Spirit Wolf. Its oracle text reads: "Creatures with power less than this creature's power can't block 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 — Spirit Wolf

Creatures with power less than this creature's power can't block 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 Uncommon

Mana Value 6

Artist David Rapoza

Collector # 182

Scryfall Gatherer