Blackcleave Tower enters the battlefield tapped unless you pay .
: Add or to your mana pool.
Sacrifice Blackcleave Tower: Add or to your mana pool.
, : Put target card from your graveyard on the bottom of your library.
.
: Add 
or to your mana pool. or to your mana pool., : Put target card from your graveyard on the bottom of your library.
