(Keldon Cradle isn't a spell.)
Keldon Cradle enters the battlefield tapped.
Attacking creatures you control get +1/+0.
: Add or to your mana pool.
: Add to your mana pool. Put Keldon Cradle on top of your library.
: Add 
or 
to your mana pool.: Add 
to your mana pool. Put Keldon Cradle on top of your library.
