Pending Remove List: Magus of the Abyss, Woebringer Demon, Reaper of the Wilds, Catacomb Sifter

Things to cut:

Blood Artist: Effect is really small unless you have some sort of infinite death trigger occurring. It's essentially a dead draw unless you have a combo in place.

Deadwood Treefolk: Can only snag creatures, while I am certain there's plentiful non creature spells you'd wanna snag. If you're adamant about keeping an additional effect like his, I'd use Greenwarden of Murasa. Sure, you only get the trigger on ETB, but it can grab any spell.

Woebringer Demon draws extra hate that you don't neccesarily need. Same goes with Magus of the Abyss

Satyr Wayfinder is too small of an effect for me to consider it worthwhile.

Deadbridge Chant: I can tell you from experience that the effect is rather underwhelming. Looks great in practice, but doesn't benefit you as much as you'd think.

Krosan Grip over Naturalize. Fade into Antiquity over Unravel the Aether

Seer's Sundial almost always winds up being a waste of mana. You're in Black, which has infinitely better card draw than the sundial.

Catacomb Sifter and Reaper of the Wilds should go. Scrying isn't all that important in this deck.

I don't like Infest. Seems weak for this format.

Elfhame Sanctuary doesn't really seem worth losing a draw to gain a basic land.

Gutter Grime: with the sheer amount of non token creatures in your deck, gutter grime, while giving you benefit for their death, isn't actually all that meaningful. Sure, you get tokens, but unless you're going with a token subtheme, I just feel like it doesn't fit.

Well, that's a start. I'll keep looking it over, but those were my immediate suggestions.

Is Deathcap Cultivator really necessary with your commander's ability and the large amount of land tutoring effects?

I also argue Mulch is not spectacular for the same points I made about Satyr Wayfinder.

Also, while once upon a time I loved Pilgrim's Eye, nowadays it seems sort of underwhelming.

Last Laugh and Pestilence Demon, while cute, don't seem particularly worthwhile. They hit you too, for one, and for two, once the board is clear, their use is gone.

I'm also not a huge fan of Heartless Summoning. If you're using it to kill your creatures, well that's what you have sac outlets for if you're using it to lower the cost of your creatures, well you should already have a ton of mana from this deck anyways.

How much use will you get out of Vampire Hexmage? I'd keep it as a sideboard card, but I think in most games it'll just be a relatively dead draw.

Put Blood Artist back as it was a key combo piece, duh.

Zulaport Cutthroat is almost strictly better than Blood Artist if you're set on keeping the effect around.While Zulaport only triggers on your deaths, it hits ALL opponents, instead of just one at a time, therefore seemingly more beneficial outside of the combo

What about Worldspine Wurm?

What benefit outside of attacking does it give you?

I own it and want to put it in a deck? That's the only reason. Well, that and it could be a pretty funny instant-speed regenerate target. I'll be pulling it in the next purge.