Cavern of Souls
Land
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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.
Official rulings
- 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)
- 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. (2023-11-10)
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