Is Porcuparrot legal in Standard, Modern, and Commander?

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

Porcuparrot

Q: What type of card is Porcuparrot?

Porcuparrot is a Creature — Bird Beast. Its oracle text reads: "Mutate {2}{R} (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.) {T}: This creature deals X damage to any target, where X is the number of times this creature has mutated."

Creature — Bird Beast

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.)