(Sea Basin isn't a spell.)
Sea Basin enters the battlefield tapped unless you pay .
Sea Basin is indestructible. (Destroy effects and lethal damage don't destroy it.)
: 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.
