Is Steelburr Champion legal in Standard, Modern, and Commander?

Steelburr Champion is legal in: Legacy, Vintage, Commander.

Steelburr Champion

Q: What type of card is Steelburr Champion?

Steelburr Champion is a Creature — Mouse Soldier. Its oracle text reads: "Offspring {1}{W} (You may pay an additional {1}{W} as you cast this spell. If you do, when this creature enters, create a 1/1 token copy of it.) Vigilance Whenever an opponent casts a noncreature spell, put a +1/+1 counter on this creature."