Flagstones Hollows enters the battlefield tapped unless you pay .
: Add or to your mana pool.
Put Flagstones Hollows on top of your library: Add to your mana pool.
: Return Flagstones Hollows to its owner's hand.
.
: Add 
or 
to your mana pool. to your mana pool. : Return Flagstones Hollows to its owner's hand.
