suggestion :- lifebane to side as he's mostly effective against 2 colours and nightveil spectre to main. or crypt ghast for bonus mana and extort. otherwise looks great ;)
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added 2 dying wish to go with desecration demon, sacrificing him to disciple will double the life gain and also deal some damage... testing some tweaks
forget cipher... unless you can make sure you hit for damage each turn for the ability to trigger, its just useless + they cost too much mana... what you need is cheap spells so you can have enough mana for them to cast and pay the extort while you swing for damage. i'll go for vile rebirth instead of cremate, pontiff of blight instead of undercity plague and essence harvest and disciple of bolas work well with the desecration demon. the only flyer able to attack is the screecher which at 1/2 is easily taken care of. the demon is probably going to stay tapped especially against token decks.
also, since you're going for mill... what about wight of the precinct six for a cheap creature?
vile rebirth will help you reabuse your apostles from the grave :)
neat way of abusing mirko :)