Answer:
Up on high I wave away but not a word can I say.
What kinds of men are always above board?
I am two-faced but bear only one. I have no legs but travel widely. Men spill much blood over me. Kings leave their imprint on me. I have greatest power when given away, yet lust for me keeps me locked away.
The eight of us move forth and back. To protect our king from the foes attack.
What begins and has no end? What is the ending of all that begins?
I can only be played on a windy day