(Flooded Verge isn't a spell.)
Flooded Verge enters the battlefield tapped.
Flooded Verge is indestructible. (Destroy effects and lethal damage don't destroy it.)
: Add or to your mana pool.
Sacrifice Flooded Verge: Add or to your mana pool.
: Add 
or 
to your mana pool. or to your mana pool.
