Cavern of Souls
1381c8f1-a292-4bdf-b20c-a5c2a169ee84
$40.58 CND
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.