Obsidian Flats enters the battlefield tapped.
: Add or to your mana pool.
Put Obsidian Flats on top of your library: Add to your mana pool.
, Sacrifice Obsidian Flats: Add to your mana pool.
: Add 
or 
to your mana pool.
to your mana pool. , Sacrifice Obsidian Flats: Add 
to your mana pool.
