Thanks for the suggestions furie. I have replaced the Rebukes with Azorius Charms and the Invisible Stalkers with Precinct Captains.
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This looks like discard deck that leans very heavily toward the power of vampires. If you want more discard maybe put in some specters? If you have already play tested this deck and it works then go with what you got. It depends on what is the goal for this deck. Reply me and I'll be more sure hopefully on how to help.
Quest for the Nihil stone is an excellent card, especially if you have your cunning lethemancer out on the field.