Cavern of Souls
Land · MV 0.0
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.
2023-11-10 · The spell can't be countered if the mana produced by Cavern of Souls is spent to cover any cost of the spell, even an additional cost such as a kicker cost. This is true even if you use the mana to pay an additional cost while casting a spell "without paying its mana cost."
2023-11-10 · You must choose an existing creature type, such as Human or Warrior. Card types such as artifact can't be chosen.
2018-12-07 · The spell can't be countered if the mana produced by Cavern of Souls is spent to cover any cost of the spell, even an additional cost such as a kicker cost. This is true even if you use the mana to pay an additional cost while casting a spell "without paying its mana cost."
2018-12-07 · You must choose an existing creature type, such as Human or Warrior. Card types such as artifact can't be chosen.