Flat Reef enters the battlefield tapped unless you sacrifice a colorless permanent.
: Add or to your mana pool.
: Add to your mana pool. Put Flat Reef on top of your library.
At the beginning of your upkeep, you may gain 1 life.
: Add 
or 
to your mana pool.: Add 
to your mana pool. Put Flat Reef on top of your library.
