Answer:
It is the great nemesis of the lactose intolerant.
A tiny bead, like fragile glass, strung along a cord of grass.
Look into my face and I'm everybody. Scratch my back and I'm nobody.
It can cause deflation of tires when dropped from the rear of spy cars.
My first is a creature whose breeding is unclear. My second, a price you must pay. My whole can be found in the river of Time and refers to events of today.
Do what he says and you'll be fine, don't and you lose the game.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?