Is Zhao, the Moon Slayer legal in Standard, Modern, and Commander?

Zhao, the Moon Slayer is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Zhao, the Moon Slayer?

Zhao, the Moon Slayer is a Legendary Creature — Human Soldier. Its oracle text reads: "Menace Nonbasic lands enter tapped. {7}: Put a conqueror counter on Zhao. As long as Zhao has a conqueror counter on him, nonbasic lands are Mountains. (They lose all other land types and abilities and have "{T}: Add {R}.")"