(Hollow Pools isn't a spell.)
Hollow Pools enters the battlefield tapped unless you pay .
Whenever a card is put into a graveyard from anywhere, exile that card.
: Add to your mana pool.
: Add or to your mana pool. Each opponent gains 1 life.
.
: Add 
to your mana pool.: Add 
or 
to your mana pool. Each opponent gains 1 life.
