You have a lot of potentially solid cards, but I am failing to see a coherent strategy. Ghen, arcanum weaver really feels like unexplored design space for BIG enchantment reanimator. For example, you could use a proactive enchantment based strategy to curse your opponents. You are in the 3 best colors (in my opinion) for such a strategy.
Overwhelming Splendor is such a card, but far from the only one.
In such a case, you need looting/graveyard synergy (
Entomb is noted) whereas a card like
Gravebreaker Lamia is powerful, but somehow not present despite being as good as it is going to get for a card not named entomb. Other than that, I see a lot of griefer/stax enchantments, but they seem to do little besides making the table hate you. If you're going to be hated, then lock them out!
If you can, I would try to use smaller enchantments with powerful etb triggers then sacrifice them to ghen to get the bigger enchantments out later. Examples would include, but are not limited to:
Omen of the Dead
Sarcomancy
Animate Dead (note: doesn't say it has to be your creature that gets animated)
Oath of Chandra
Rise of the Hobgoblins (doubles as wincondition and loves to be reanimated)
Trial of Ambition
Treacherous Blessing
The constellation cards in black are often overcosted, so something like
Thoughtrender Lamia becomes more viable when you're reanimating for 3 mana. Of course, if you kill enough creatures (or cause enough discard/mill), then
hedonist's trove becomes a beating and you're only aiming to pay 3 for it AND it becomes reuseable.
I could keep going on and on, but I would pick a strategy or two and stick with it.