Is Akoum Firebird legal in Standard, Modern, and Commander?

Akoum Firebird is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

Akoum Firebird

Q: What type of card is Akoum Firebird?

Akoum Firebird is a Creature — Phoenix. Its oracle text reads: "Flying, haste This creature attacks each combat if able. Landfall — Whenever a land you control enters, you may pay {4}{R}{R}. If you do, return this card from your graveyard to the battlefield. Power/Toughness: 3/3"