1. Can you activate Amazoness Archers on a face-down Amazoness? The card doesn't actually specify it, and I didn't see anything about it in the yugioh-card site.

Amazoness Archers:
2. Can you use My Body as a Shield to stop The Law of the Normal?

Law of the Normal:
My Body as a Shield:
3. If I activate Scapegoat on my opponent's turn and they attack them while my Human-wave tactics is face-up, will I get to special summon monsters?

Human-wave tactic:

Scapegoat:

4. My last question is about Necrovalley. Does anyone know a site, link, whatever, that tell you every single card the Necrovalley negates?

1. A monster in face down position is only considered a set monster, it does not retain its name until it is face up. Therefore you may not use amazoness archers while you have a face down amazoness, it must be face up.

2. You may use My Body As a Shield to negate and destroy Law of the Normal as it does destroy 1 or more of your monsters.

3. You won't be able to special summon that same turn because Scapegoat doesn't allow you to summon anymore monsters the same turn it was activated.

4. There's no need to list EVERY card as long as you understand the basic concept of how it works. Necrovalley will negate anything that is attempting to affect the graveyard from the outside (Magician of Faith, Fiber Jar, Mask of Darkness). It doesn't negate cards that function from within the graveyard (Mystic Tomato, Sangan, Sacred Phoenix of Nepthys).

Magus has them all right, but I want to clarify them a tad.

1) just go with magus

2) As long as it includes destroying 1 or more monsters (i.e. even if it says destroy one card on the field) then it is available for my body.

3) If scapegoat ISN'T activated that turn, however, then its free reing on deck thinning.

4) Go with magus.

I understand most of the cards that Necrovalley will negate, but there are some cards, such as "Cemetery Bomb" and "Mudora" that don't affect the graveyard, but their effects use the graveyard. Would they be negated?

This two cards you have mentioned DON'T use the graveyard they mearly count a number of cards needed to complete their effect................. there's no involvment of any cards whatsoever when using this 2 cards..........