I would throw a Vampiric Tutor and a Tormod's Crypt in this deck, or at least another Haunting Echoes. Maybe take out one of the legends?
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4 Dark Rituals should be a given. Also check out Buried Alive to get all of the Servitors in your graveyard.
The evolution of this deck, for those who care: Angelic Voices > Glorious Anthem > Wizened Cenn White Knight > Longbow Archer > Knight of Meadowgrain Tundra Wolves > Mosquito Guard Soltari Priest > Mistmeadow Skulk Army of Allah > Fortify Icatian Town > Spectral Procession Petal/Sol Ring > Null Rods Ruins of Trokair > New Benalia
Nope, it was unrestricted last year: http://www.wizards.com/default.asp?x=mtgcom/daily/af173
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