Is Guardian of the Forgotten legal in Standard, Modern, and Commander?

Guardian of the Forgotten is legal in: Modern, Legacy, Vintage, Commander, Historic.

Guardian of the Forgotten

Q: What type of card is Guardian of the Forgotten?

Guardian of the Forgotten is a Creature — Elephant Warrior. Its oracle text reads: "Vigilance Whenever a modified creature you control dies, manifest the top card of your library. (Equipment, Auras you control, and counters are modifications. To manifest a card, put the top card of your library onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)"

Creature — Elephant Warrior

Vigilance

Whenever a modified creature you control dies, manifest the top card of your library. (Equipment, Auras you control, and counters are modifications. To manifest a card, put the top card of your library onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

Set Modern Horizons 3

Rarity Uncommon

Mana Value 4

Artist Ron Spears

Collector # 28

Scryfall Gatherer