Is Guardian of Faith legal in Standard, Modern, and Commander?

Guardian of Faith is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Guardian of Faith

Q: What type of card is Guardian of Faith?

Guardian of Faith is a Creature — Spirit Knight. Its oracle text reads: "Flash Vigilance When this creature enters, any number of other target creatures you control phase out. (Treat them and anything attached to them as though they don't exist until their controller's next turn.)"

Creature — Spirit Knight

Flash

Vigilance

When this creature enters, any number of other target creatures you control phase out. (Treat them and anything attached to them as though they don't exist until their controller's next turn.)

Set Adventures in the Forgotten Realms

Rarity Rare

Mana Value 3

Artist Brian Valeza

Collector # 18

Scryfall Gatherer