Is Sawtusk Demolisher legal in Standard, Modern, and Commander?

Sawtusk Demolisher is legal in: Legacy, Vintage, Commander, Historic.

Sawtusk Demolisher

Q: What type of card is Sawtusk Demolisher?

Sawtusk Demolisher is a Creature — Beast. Its oracle text reads: "Mutate {3}{G} (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.) Trample Whenever this creature mutates, destroy target noncreature permanent. Its controller creates a 3/3 green Beast creature token."

Creature — 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.)