(Pinecrest Aqueduct isn't a spell.)
When Pinecrest Aqueduct enters the battlefield, sacrifice it unless you pay 3 life.
Creatures enters the battlefield tapped.
: Add or to your mana pool.
Sacrifice Pinecrest Aqueduct: Add or to your mana pool.
: Add 
or 
to your mana pool. or to your mana pool.
