Cavern of Souls [Avacyn Restored]

$55.10
Type: MTG Single
Title
Set: Avacyn Restored
Type: Land
Rarity: Rare
As Cavern of Souls enters the battlefield, 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.