You must choose an existing creature type, such as Human or Warrior. Card types such as artifact canâ€™t be chosen.
The spell canâ€™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 â€œwithout paying its mana cost.â€
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