Is Old Flitterfang legal in Standard, Modern, and Commander?

Old Flitterfang is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Old Flitterfang

Q: What type of card is Old Flitterfang?

Old Flitterfang is a Legendary Creature — Rat Faerie. Its oracle text reads: "Flying At the beginning of each end step, if a creature died this turn, create a Food token. (It's an artifact with "{2}, {T}, Sacrifice this token: You gain 3 life.") {2}{B}, Sacrifice another creature or artifact: Old Flitterfang gets +2/+2 until end of turn."

Legendary Creature — Rat Faerie

Flying

At the beginning of each end step, if a creature died this turn, create a Food token. (It's an artifact with ", , Sacrifice this token: You gain 3 life.")