Dwarven Mine is a common Land — Mountain card from Throne of Eldraine (ELD), collector number 243. Current market price: $0.55 (foil $0.99), TCGplayer market prices via Scryfall.
({T}: Add {R}.) This land enters tapped unless you control three or more other Mountains. When this land enters untapped, create a 1/1 red Dwarf creature token.