Watery Grave is a rare Land — Island Swamp card from Ravnica: City of Guilds (RAV), collector number 286. Current market price: $16.68 (foil $159.60), TCGplayer market prices via Scryfall.
({T}: Add {U} or {B}.) As this land enters, you may pay 2 life. If you don't, it enters tapped.