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I would take out one essence harvest and one tribute to hunger and put in 2 dreadbore s in their place, only need 2 essence harvest s they hits really hard and unexpectedly when your playing desecration demon , but playing too many of them can be detrimental because they require you have a board presence.

right now you have a lot of mana growth through things like  liliana of the dark realms and crypt ghast , but nothing all to big to spend that mana on, I would suggest throwing in 1 or 2  griselbrand s, with crypt ghast on the field on turn 4 you can hardcast a griselbrand on turn 5; I would sadly suggest to take out 2 liliana of the dark realms , crypt ghast is going to ramp your mana up a lot faster than she could.

I would suggest adding more lands as well, 22 isn't really enough for a control deck, I would add 2 more swamps, perhaps taking out 1 duress and 1 slaughter games , slaughter games is mainboardable, but only to such an extent because the first game your not going to know what the enemy is playing. I would also suggest getting 4 dragonskull summit s for the deck as well, they will hurt your mutilate s but with 18+ swamp s it will not be too big of a deal, I would also suggest playing at least one Stensia Bloodhall it is deceptively good vs control match ups, its basically 2 damage they cannot prevent every turn, which will add up after a while, the best part is that the damage can be redirected to planeswalkers.

for control match ups i would also suggest adding 1 Disciple of Bolas on your sideboard, him + desecration demon = refilled hand and life, UW control likes to use tamiyo to keep big guys like that tapped out so just sac him in response then throw down some more threats and beat face. your biggest threat is probably going to be aggro matches with things like GW aggro, RDW and BR aggro, the guy I use to hold off those kind of threats is supricingly Stromkirk Captain , you have enough vampires in this deck to validate him on the sideboard, giving your vampire nighthawk or olivia voldaren first strike can often times create a wall most aggro decks won't simply be able to plow through, not to mention first strike + deathtouch means they die before get past the first strike phase no mater how strong they are. If you don't like that Idea I also use Hanweir Watchkeep its ironic, but this werewolf will always be a 1/5 wall so long as you cast at least one spell during your turn, and if you don't cast one he becomes a 5/5 wall, often times RDW can't get past 5 toughness, and BR aggro also has a very similar problem, GW aggro can beat it eventually but it slows them down enough to stablize as a control deck and take over the game.

I would also suggest adding some instant kill spells to the sideboard, a surprice thundermaw hellkite , silverblade paladin or hellrider  can ruin your game very fast, something like searing spear , victim of night or ultimate price ; in fact I would suggest replacing 1 of the tribute to hunger s in your deck with a ultimate price for sure, it won't hit everything, but I would rather have targeted removal rather than an edict effect right now, if you don't get some threats off the field immediately you lose the game. victim of night will probably become the more viable option as more gold colored cards become available in GTC, it can take care of a lot of baddies right now, but not all of them.