Is Angelic Favor legal in Standard, Modern, and Commander?

Angelic Favor is legal in: Legacy, Vintage, Commander.

Angelic Favor

Q: What type of card is Angelic Favor?

Angelic Favor is an Instant. Its oracle text reads: "If you control a Plains, you may tap an untapped creature you control rather than pay this spell's mana cost. Cast this spell only during combat. Create a 4/4 white Angel creature token with flying. Exile it at the beginning of the next end step."