The Black Gate is a rare Legendary Land — Gate card from Tales of Middle-earth Commander (LTC), collector number 160. Current market price: $16.82, TCGplayer market prices via Scryfall.
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.