When Obsidian Chamber enters the battlefield, sacrifice it unless you pay 1 life.
, : Add , or to your mana pool. Obsidian Chamber deals 1 damage to you.
: Obsidian Chamber becomes a 2/2 black Specter creature until end of turn. It's still a land.
, 
: Add 
, 
or to your mana pool. Obsidian Chamber deals 1 damage to you.: Obsidian Chamber becomes a 2/2 black Specter creature until end of turn. It's still a land.
