Answer:
I am the yellow hem of the sea's blue skirt.
What runs around the whole yard without moving?
What Can Fly Without Wings
I never was but am always to be, and everyone looks forward to me
The most fabulous way to locate pots of gold
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.