Caverna de ánimas

Text:

En cuanto la Caverna de ánimas entre al campo de batalla, elige un tipo de criatura.
: Agrega a tu reserva de maná.
: Agrega un maná de cualquier color a tu reserva de maná. Usa este maná sólo para lanzar un hechizo de criatura del tipo elegido y ese hechizo no puede ser contrarrestado.

Rulings:

• 12/7/2018 You must choose an existing creature type, such as Human or Warrior. Card types such as artifact can’t be chosen.
• 12/7/2018 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.”