Its a nice deck but I reccomend:
Otyugh: Some more Creature Control. Its need for every deck
Sapphire Charger/Momentum: When those Dim. Shields/Procrastinations come out, your overdrived Voodoos are dead as a duck stuck in muck
Black Hole/Drain Life: Some stall to keep you alive while those Voodoos start getting damage out, that dagger will help, but its not exactly as helpful as sancutary or SOG
Armargio: Some more Stall
Nightfall/Eclipse: Another +1/+1 or +2/+1 wont exactly be killing those voodoos along with the fact it gives another +2/0 to the Voodoo
But its just my opinion...(and a little more steals)