(Centaur Catacomb isn't a spell.)
When Centaur Catacomb enters the battlefield, you lose 1 life unless you reveal an artifact card from your hand.
, : You may put a land card from your hand onto the battlefield.
, : Add or to your mana pool.
, 
: You may put a land card from your hand onto the battlefield., : Add 
or 
to your mana pool.
