(Keldon Cradle isn't a spell.)
When Keldon Cradle enters the battlefield, sacrifice it unless you pay 2 life.
, : You may put a land card from your hand onto the battlefield.
, : Add to your mana pool.
, 
: You may put a land card from your hand onto the battlefield.
, : Add 
to your mana pool., : Add to your mana pool.
