It is a cool concept. However, it is just a highly out-dated infect deck. I don't see why you need hivestone when you only have 1 sliver, and all your other creatures have the same effect as it does. The other spells are great, its just the creatures could be better.
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I would suggest getting rid of some cards till you have 60 total, namely Basilisk Collar and CloudHeath Drake. And then, perhaps, get rid of a few more cards and put in some more land.
Thanks. Progentius is awesome, and you're right, Kozilek and Ulamog are overkill. I'll put in a few more tutors too.
I like this deck a lot. I would suggest replacing decree of savagery with something else, because if you can afford to play it, you probably already won the game. P.S. Hydras are awesome
I am not an infect expert. But I have played against a lot of infect decks, so I can say yours is pretty good. I would suggest some more enchantments like Boar Umbra, and Unholy Strength to make the smaller infect creatures considerably more impressive.
Overall, I think it is a good deck, if scary to be playing against. However, I would suggest replacing Necromancer's Magemark, Mortuary, Betrayal of Flesh,and Bone Harvest with other cards, since they remove creatures from your graveyard, and you have several creatures that are better with more creatures in your graveyard.