Is The Black Gate legal in Standard, Modern, and Commander?

The Black Gate is legal in: Legacy, Vintage, Commander.

What type of card is The Black Gate?

The Black Gate is a Legendary Land — Gate. Its oracle text reads: "As The Black Gate enters, you may pay 3 life. If you don't, it enters tapped. {T}: Add {B}. {1}{B}, {T}: Choose a player with the most life or tied for most life. Target creature can't be blocked by creatures that player controls this turn."