When Pinecrest Barrens enters the battlefield, sacrifice it unless you pay .
: Add or to your mana pool.
: Add to your mana pool. Put Pinecrest Barrens on top of your library.
: Regenerate Pinecrest Barrens.
.
: Add 
or to your mana pool.: Add 
to your mana pool. Put Pinecrest Barrens on top of your library.: Regenerate Pinecrest Barrens.
