Answer:
I dig out tiny caves and store gold and silver in them. I also build bridges of silver and make crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs my help. Yet many people are afraid to let me help them.
It holds no blessings in disguise. Its rhymes are aimed at your demise, it's cast only to ruin, Whatever you are doin'.
Jack and Jill when up the hill jack fell down
I can travel from there to here by disappearing, and here to there by reappearing.
I bind it and it walks. I loose it and it stops.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.