(Brush-Cavern isn't a spell.)
Brush-Cavern enters the battlefield tapped.
, : You may put a land card from your hand onto the battlefield.
: Add to your mana pool. If you played a land this turn, Add to your mana pool instead.
, 
: You may put a land card from your hand onto the battlefield.: Add 
to your mana pool. If you played a land this turn, Add 
to your mana pool instead.
