Blood Crypt is a rare Land — Swamp Mountain card from Ravnica Allegiance Promos (PRNA), collector number 245p. Current market price: $13.20 (foil $20.62), TCGplayer market prices via Scryfall.
({T}: Add {B} or {R}.) As this land enters, you may pay 2 life. If you don't, it enters tapped.