Secluded Courtyard is a uncommon Land card from Modern Horizons 3 Commander (M3C), collector number 372. Current market price: $0.40, 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.