Overgrown Tomb is a rare Land — Swamp Forest card from Ravnica: City of Guilds (RAV), collector number 279. Current market price: $12.73 (foil $119.97), TCGplayer market prices via Scryfall.
({T}: Add {B} or {G}.) As this land enters, you may pay 2 life. If you don't, it enters tapped.