Is Steel Hellkite legal in Standard, Modern, and Commander?

Steel Hellkite is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Steel Hellkite?

Steel Hellkite is an Artifact Creature — Dragon. Its oracle text reads: "Flying {2}: This creature gets +1/+0 until end of turn. {X}: Destroy each nonland permanent with mana value X whose controller was dealt combat damage by this creature this turn. Activate only once each turn."