(Farm Tar Pit isn't a spell.)
Farm Tar Pit enters the battlefield tapped unless you control one or more creatures.
, : Look at target player's hand.
: Add or to your mana pool.
Sacrifice Farm Tar Pit: Add or to your mana pool.
, 
: Look at target player's hand.: Add 
or 
to your mana pool. or to your mana pool.
