What is harder to catch the faster you run?

what is a shark's favorite game?

i am taken from a mine, and shut up in a wooden case, from which i am never released, and yet i am used by almost everybody.

some say we are red, some say we are green. some play us, some spray us.
what are we?

many-manned scud-thumper, maker of worn wood, shrub-ruster, sky-mocker, rave! portly pusher, wind-slave.
what am i?