(Obsidian Plain isn't a spell.)
Whenever Obsidian Plain becomes tapped, it deals 1 damage to you.
, : You may put a land card from your hand onto the battlefield.
: Add to your mana pool.
: Add or to your mana pool. Each opponent gains 1 life.
, 
: You may put a land card from your hand onto the battlefield.: Add to your mana pool.: Add 
or 
to your mana pool. Each opponent gains 1 life.
