Cavern of Souls 226/244 (The List Reprints)

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, and that spell can't be countered.

NM - $99.10
LP - $79.30
MP - $59.50
HP - $39.70
DMG - $19.90