Mariposa Military Base is a rare Land card from Fallout (PIP), collector number 151. Current market price: $0.40 (foil $0.33), TCGplayer market prices via Scryfall.
You may have this land enter tapped. If you do, you get two rad counters. {T}: Add {C}. {5}, {T}: Draw a card. This ability costs {1} less to activate for each rad counter you have.