(Pine Bluffs isn't a spell.)
Pine Bluffs enters the battlefield tapped unless you reveal a multicolored card from your hand.
Green creatures get +1/+1.
: Add to your mana pool. If you played a land this turn, Add to your mana pool instead.
: Add 
to your mana pool. If you played a land this turn, Add 
to your mana pool instead.
