Is Eclipsed Realms legal in Standard, Modern, and Commander?

Eclipsed Realms is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Eclipsed Realms?

Eclipsed Realms is a Land. Its oracle text reads: "As this land enters, choose Elemental, Elf, Faerie, Giant, Goblin, Kithkin, Merfolk, or Treefolk. {T}: Add {C}. {T}: Add one mana of any color. Spend this mana only to cast a spell of the chosen type or activate an ability of a source of the chosen type."