Cavern of Souls

Land

As Cavern of Souls enters the battlefield, choose a creature type.

{T}: Add {1} to your mana pool.

{T}: Add one mana of any color to your mana pool. Spend this mana only to cast a creature spell of the chosen type, and that spell can't be countered.

Illus. Cliff Childs

Gatherer Card Rulings?, Legality?

• 5/1/2012: You must choose an existing _Magic_ creature type, such as Zombie or Warrior. Card types such as artifact can't be chosen.
• 5/1/2012: 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."

• Legal in Vintage (Type 1)
• Legal in Legacy (Type 1.5)
• Legal in Extended (Type 1.X)
• Legal in Standard (Type 2)
• Legal in Classic (MTGO)
• Legal in Commander
• Legal in Modern