What Am I Riddles

Question: My first doth affliction denote,
which my second is destined to feel.
And my whole is the best antidote,
that affliction to soften and heal.

What am I?

Question: I drape the hills in white,
I do not swallow, but I do bite.

What am I?

Question: What goes up when the rain goes down?

Question: Look at me I want to play.
I'll move like you in every way.
Be tricky, but the result is always a draw.
Why? Because I'm an expert at response and call.

What am I?

Question: Light hides me and darkness kills me.

What am I?