Is Secluded Glen legal in Standard, Modern, and Commander?

Secluded Glen is legal in: Modern, Legacy, Vintage, Commander.

What type of card is Secluded Glen?

Secluded Glen is a Land. Its oracle text reads: "As this land enters, you may reveal a Faerie card from your hand. If you don't, this land enters tapped. {T}: Add {U} or {B}. *Protected by glamers and guile, Glen Elendra harbors the elusive Oona, queen of the fae.*"