Is Parcelbeast legal in Standard, Modern, and Commander?

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

Parcelbeast

Q: What type of card is Parcelbeast?

Parcelbeast is a Creature — Elemental Beast. Its oracle text reads: "Mutate {G}{U} (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.) {1}, {T}: Look at the top card of your library. If it's a land card, you may put it onto the battlefield. If you don't put the card onto the battlefield, put it into your hand."

Creature — Elemental Beast

$0.24 ↗20 similarCommander, Modern

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.)

, : Look at the top card of your library. If it's a land card, you may put it onto the battlefield. If you don't put the card onto the battlefield, put it into your hand.