Is Aeronaut Cavalry legal in Standard, Modern, and Commander?

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

Aeronaut Cavalry

Q: What type of card is Aeronaut Cavalry?

Aeronaut Cavalry is a Creature — Human Soldier. Its oracle text reads: "Flying When this creature enters, put a +1/+1 counter on another target Soldier you control. *"The ground is where wars are waged, but the air is where they are won." —Harbin, vanguard aviator* Power/Toughness: 3/4"