Overgrown Tomb is a rare Land — Swamp Forest card from Guilds of Ravnica (GRN), collector number 253. Current market price: $8.20 (foil $12.73), 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.