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Good mix of shadows and spells there, but you're lacking in blockers. Maybe you could take some walls and replace some shadows? Just an idea. Check out my deck, its kinda like your deck but with unblockable creatures in place of shadows and some blockers: http://www.mtgvault.com/ViewDeck.aspx?DeckID=37560
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Another solution would be to splash blue and in Shadow Rift so you can give their attackers shadow unexpectedly and block them. Or vice versa, splash green and use Reality Anchor to remove shadow from your creatures - but it's 1 more expensive. There could be other fun ways to play with adding and removing shadow from creatures on the battlefield, but those are the first ones I saw.
To both of you. Read Dauthi Embrace that is what you ask for right? Second I would replace Damnation and Choice of Damnations and maybe even Vile Requiem with some spot removal as your opponent hopefully aren't surviving long enough for Vile Requiem and Choice of Damnations to be effective. And Damnation just just ruins you in this deck as it is creature-based.
wall of shadows would be excellent for thy deck.