Cavern of Souls

Land   

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

237 UMA • ENRichard Wright

™ & © 1993— Wizards of the Coast

Notes: TODO: Update Copyright

Legal in: Modern,Innistrad Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Tribal Wars Standard,Singleton 100,Commander

Oracle Text (click to copy):

Cavern of Souls Land As Cavern of Souls enters the battlefield, choose a creature type. {T}: Add {C} 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.

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View this MTG card on Gatherer

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."

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Card Cavern of Souls is not on TCGPlayer.