When Obsidian Gorge enters the battlefield, sacrifice it unless you pay 1 life.
: Add to your mana pool. If you played a land this turn, Add to your mana pool instead.
When Obsidian Gorge enters the battlefield, put a -1/-1 counter on target land.
: Add 
to your mana pool. If you played a land this turn, Add 
to your mana pool instead.
