Secluded Courtyard is a mythic Land card from Special Guests (SPG), collector number 63. Current market price: $8.94 (foil $33.78), TCGplayer market prices via Scryfall.
As this land enters, choose a creature type. {T}: Add {C}. {T}: Add one mana of any color. Spend this mana only to cast a creature spell of the chosen type or activate an ability of a creature source of the chosen type.