Obsidian Flats enters the battlefield tapped unless you sacrifice a Spirit.
: Add to your mana pool. If you played a land this turn, Add to your mana pool instead.
: Return Obsidian Flats to its owner's hand.
: Add 
to your mana pool. If you played a land this turn, Add 
to your mana pool instead.: Return Obsidian Flats to its owner's hand.
