MTG Salvation

Never really made a deck. I think this has some alright synergies, but I'm not sure how to go about improvement.

First, general deckbuilding tips. If a card is good enough to run you probably want to run multiple copies to increase your chances of drawing it. Random singletons lead to inconsistent draws, and less focus on what you want to be doing to win the game. Toolbox decks (decks built around the ability to search the deck for the specific card they want at a given time) are the exception, as are legendary cards or cards that have an extremely high mana cost.

If you want to focus on graveyard schenigans, you have a number of cards that need to be cut. They may have morbid, but if you want to just but power on board, we can do that better with a Boneyard Wurm + Splinterfright deck. Instead I'm focusing on Skirsdag High Priest here with cards that control the field to maximize it's value.

Predator Ooze is too color intense at GGG
Lumberknot is powerful, but is better in a deck that wants a big hexproof beater than one that wants to do unfair things with its graveyard.
Algae Gharial is pretty bad at 4 mana for a 1/1
Ulvenwalkd Bear is another card that is only a beater.
Festerhide Board again doesn't do much.
Howlgeist - Lots of mana for only two creatures with no relevant abilities.
Essence of the Wild is good, but needs to be in a deck that generates token from non-creature sources. Its a build around card and doesn't belong here.
Demonmail Hauberk - This is straight card disadvantage for almost no value. In addition equip can only be activated at sorcery speed.
Vial of Poison - If you want deathtouch, play a deathtouch creature. Playing a kill spell is probably better though.
Feast or Famine - Too expensive.
Nightmare Void - Unnecessary. Trading 1-for-1 against the opponent's hand isn't good at three mana.

Cards you want more of:
Disciple of Griselbrand - I'm not a big fan of this guy, but he provides a sac outlet until you find something better, and the life gain is sometimes relevant
Skirsdag High Priest - This should be your core creature. Play 4.
Reassembling Skeleton - Play four, or even better change out for Bloodsoaked Champion. The champion can't block, but comes in untapped to help your Skirsdag High Priest.
Strangleroot Geist - Great card, GG is a bit heavy, but 2 power + undying for 2 mana is awesome. Could be supplemented with Young Wolf
Gutter Grim - Optional card and mana intensive, but if you have a good enough control package it can be quite strong.

Cards to consider:
Blood Artist - This is an upgrade for your Falkenrath Noble. Should probably play 4.
Tragic Slip - 1 cmc removal is just good.
Malicious Affliction - Killing 2 creatures for 2 mana is just amazing.
Bone Splinters
Birthing Pod - Will change the deck significantly (you'll have to re-evaluate all of your creatures based on mana cost) but is insanely strong.
Reaper from the Abyss - Good 6 cmc replacement for Essence of the Wild. Not strictly necessary
Wakedancer - Mostly played in Birthing Pod builds, but gives 4 power for three mana across two bodies. With pod it lets you restart strings.
Unearth - Reanimates your undying creatures, Skirsdag High Priest, or Blood Artist.

So this is an updated list. Not complete, but I like the direction it's going. I don't have any 3 cost cards in here, wondering if I should find something that fits or not. Thank you so much for the help so far Kumlekar and Xyx! Been very useful!

Culling the Weak can set you up with an explosive start.

Hmm. I was considering adding some Dark Ritual, but with the sac, that seems a better choice.