Nice deck, when I checked it I noticed that Cemetery Reaper can exile from any graveyard not like I thought only yours. I dont see much use for Curse of Echoes but I can be wrong. Levitation is good card especially when your creatures don't fly by themselves but I think 4 is to much, I would go with 2 or 3. also you need some removers like Doom Blade, Tragic Slip or something similar, or maybe you want to use Curse of Echoes to copy removers from opponents deck then I see point for this card.
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actually this deck is built because i can't buy some cards, here is deck i would build with access to all cards: http://www.mtgvault.com/ViewDeck.aspx?DeckID=319904