Cori Mountain Monastery is a rare Land card from Tarkir: Dragonstorm Promos (PTDM), collector number 252p. Current market price: $0.50 (foil $0.46), TCGplayer market prices via Scryfall.
This land enters tapped unless you control a Plains or an Island. {T}: Add {R}. {3}{R}, {T}: Exile the top card of your library. Until the end of your next turn, you may play that card.