When Brush-Cavern enters the battlefield, sacrifice it unless you pay .
: Add or to your mana pool.
: Add to your mana pool. Put Brush-Cavern on top of your library.
, , Sacrifice Brush-Cavern: Destroy target Bear.
.
: Add or 
to your mana pool.: Add 
to your mana pool. Put Brush-Cavern on top of your library., , Sacrifice Brush-Cavern: Destroy target Bear.
