Is Hidden Necropolis legal in Standard, Modern, and Commander?

Hidden Necropolis is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

Hidden Necropolis

Q: What type of card is Hidden Necropolis?

Hidden Necropolis is a Land — Cave. Its oracle text reads: "This land enters tapped. {T}: Add {B}. {4}{B}, {T}, Sacrifice this land: Discover 4. Activate only as a sorcery. (Exile cards from the top of your library until you exile a nonland card with mana value 4 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)"

Land — Cave

This land enters tapped.

: Add .

, , Sacrifice this land: Discover 4. Activate only as a sorcery. (Exile cards from the top of your library until you exile a nonland card with mana value 4 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)