Answer:
Without a bridle, or a saddle, across a thing I ride a-straddle. And those I ride, by help of me, though almost blind, are made to see.
A dragons tooth in a mortals hand, I kill, I maim, I divide the land.
With sharp edged wit and pointed poise. It can settle disputes without making a noise.
I bind it and it walks. I loose it and it stops.
Where do you go in through one hole and come out through two holes at the same time?
I can only be played on a windy day