Is Monk Gyatso legal in Standard, Modern, and Commander?

Monk Gyatso is legal in: Legacy, Vintage, Commander, Historic.

Monk Gyatso

Q: What type of card is Monk Gyatso?

Monk Gyatso is a Legendary Creature — Human Monk. Its oracle text reads: "Whenever another creature you control becomes the target of a spell or ability, you may airbend that creature. (Exile it. While it's exiled, its owner may cast it for {2} rather than its mana cost.)"

Legendary Creature — Human Monk

Whenever another creature you control becomes the target of a spell or ability, you may airbend that creature. (Exile it. While it's exiled, its owner may cast it for rather than its mana cost.)