Sandstone Pools enters the battlefield tapped.
: Add to your mana pool. If you played a land this turn, Add to your mana pool instead.
: Sandstone Pools becomes a 2/2 blue Merfolk creature until end of turn. It's still a land.
: Add 
to your mana pool. If you played a land this turn, Add 
to your mana pool instead.
: Sandstone Pools becomes a 2/2 blue Merfolk creature until end of turn. It's still a land.
