Huge fan of Amos. It would instantly make me want to go back to the good ole deck shredders (Green/Silver & Evil Gold), and would give them a little better edge while also offering great soul generation.
I can image people questioning this as "over powered", but in my opinion we've started going a little too far with cutting back abilities. If your opponent is scared of losing two cards off deck every turn then he's probably doing his job and that's probably why it made it into a deck.
"Cannot be Negated" is by no means over the top, and would continue to make Green/Gold decks a very happy home for Covenant with Death. Want to use all those discard off the top abilities under CwD? Activate Oppressed and Robbed on Pithom!
I love how you could attack with Amos (Hidden Treasures active)... reveal SoG and a Lost Soul, then, knowing SoG was there, you Sword of the Lord your Huge Egyptian into battle to discard the top card... It's like you were able to "Prophesy" or something