When River Tar Pit enters the battlefield, return a land you control to its owner's hand.
: Add to your mana pool. If you played a land this turn, Add to your mana pool instead.
, : Add one mana of any color to your mana pool.
: Add 
to your mana pool. If you played a land this turn, Add 
to your mana pool instead.
, : Add one mana of any color to your mana pool.
