Is Nightmare Shepherd legal in Standard, Modern, and Commander?

Nightmare Shepherd is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Nightmare Shepherd

Q: What type of card is Nightmare Shepherd?

Nightmare Shepherd is an Enchantment Creature — Demon. Its oracle text reads: "Flying Whenever another nontoken creature you control dies, you may exile it. If you do, create a token that's a copy of that creature, except it's 1/1 and it's a Nightmare in addition to its other types."

Enchantment Creature — Demon

Flying

Whenever another nontoken creature you control dies, you may exile it. If you do, create a token that's a copy of that creature, except it's 1/1 and it's a Nightmare in addition to its other types.

Set Duskmourn: House of Horror Commander

Rarity Rare

Mana Value 4

Artist Tyler Jacobson

Collector # 149

Scryfall Gatherer