I swallow rivers, vast and deep, My layered walls, ancient secrets keep. What am I, where echoes sleep?

I am not leaf, nor beast, nor seed, but from them all, I take what I need. From what is left, I make my start, a rise from rot, a hidden part.

I have four leaves, but no hands to hold. I bring good luck, or so I'm told.

From medieval fears to farmers’ woes, my shadow falls wherever it goes.

I have a head, but I have no brain,I have a heart, but it feels no pain.I can be an iceberg, but I sink no ship. You dress me, toss me, before I even touch your lips.