Answer:
What gets sharper the more you use it?
Can not be bought, Can not be sold, Even if it's made of gold. What is it?
Though not a plant I have leaves. though not a beast I have spine. Though many wouldn't need me I am more valuable than wine.
I have feet on my head
I pass before the sun but make no shadow. What am I?
What never gets any wetter no matter how hard it rains?