Is Leyline Binding legal in Standard, Modern, and Commander?

Leyline Binding is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Leyline Binding

Q: What type of card is Leyline Binding?

Leyline Binding is an Enchantment. Its oracle text reads: "Flash Domain — This spell costs {1} less to cast for each basic land type among lands you control. When this enchantment enters, exile target nonland permanent an opponent controls until this enchantment leaves the battlefield."