Land- Cavern Of Souls
Land: As Cavern Of Souls enters the battlefield, choose a creature type.
: Add to your mana pool.
: Add one mana of any color to your mana pool. Spend this mana only to play a creature of the chosen type. That creature cannot be countered.
Didn't see this posted yet. Couldn't believe this was printed, but saw starcity selling them and changed my mind. Seems so broken.