The main problem with your deck is that all its creatures have low health, and hence it is susceptible to creature control. A single Otyugh can eat your strategic cards, that is to say the bloodsuckers and retrovirii, alternatively, a single Fire Storm would wipe your creatures off the board.
One of the solutions I have for you is vamps, which at 6|4 upped and eclipsed will be less vulnerable and also provide some regen. Mummies and gargoyles can similarly be used as hard hitters. I would go for the discount entirely option--maybe you should try a mono
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with
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mark, using Pests, Vampires, Gargoyles and Eclipses.