Is Vulpikeet legal in Standard, Modern, and Commander?

Vulpikeet is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

Vulpikeet

Q: What type of card is Vulpikeet?

Vulpikeet is a Creature — Fox Bird. Its oracle text reads: "Mutate {2}{W} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.) Flying Whenever this creature mutates, put a +1/+1 counter on it. Power/Toughness: 2/3"

Creature — Fox Bird

Mutate (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)