Tranquil River enters the battlefield tapped unless you pay .
: Add or to your mana pool.
Put Tranquil River on top of your library: Add to your mana pool.
, Sacrifice Tranquil River: Add to your mana pool.
.
: Add 
or 
to your mana pool.
to your mana pool. , Sacrifice Tranquil River: Add to your mana pool.
