Hollow Cradle enters the battlefield tapped unless you sacrifice an artifact creature.
: Add or to your mana pool.
Put Hollow Cradle on top of your library: Add to your mana pool.
, : Add one mana of any color to your mana pool.
: Add 
or 
to your mana pool.
to your mana pool. , : Add one mana of any color to your mana pool.
