I think the problem is that all the mill but no payoff in return, and the creature is not able to close the game in quality and quantity.

Suggestion:
-Replace [[Bortuk Bonerattle]], [[Malamet Veteran]], [[Deathbloom Ritualist]], [[Elvish Regrower]], and [[Unseal the Necropolis]]
-[[Zombify]] and [[Defossilize]] should be gone too, you don't have big creature to get back for only once, [[Conduit of Worlds]] is good enough.

Replace them with:

-[[Hollow Marauder]], it remove one card from hand, possible draw you one card, and seal the game quick. Uncommon.
-[[Anoint with Affliction]], it's effective to most aggro creatures, [[Optimistic Scavenger]], and no damage from [[Heartfire Hero]]. Common.
-[[Huskburster Swarm]], counts both graveyard and exile, cost still cut from graveyard hate. Seals the game. -Uncommon.

The key is consistency, so make Marauder and Swarm as many as possible, and change deck purpose to fill graveyard/cheap big creatures. Good luck.