Leechridden Swamp is a uncommon Land — Swamp card from Duel Decks: Nissa vs. Ob Nixilis (DDR), collector number 65. Current market price: $0.78, TCGplayer market prices via Scryfall.
({T}: Add {B}.) This land enters tapped. {B}, {T}: Each opponent loses 1 life. Activate only if you control two or more black permanents.