Massacre Wurm can clear out smaller enemies, and be revived with
Kaya's Ghostform to double proc it's ability.
Archfiend's Vessel is great for sacrifice fodder, as bringing it back summons a 5/5 demon. Can combo with Call of the Death-Dweller to bring out two demons.
Serrated Scorpion can be brought back and forth for cheap damage / life gain.
Ayara, First of Locthwain is for small chip / damage while moving creatures around. Great black devotion buildup, and draw power.
Nightmare Shepherd copies creatures for their abilities on entry (Wurm), or for extra fodder power. Does not combo with Kaya's Ghostform.
Priest of Forgotten Gods can sac multiple creatures on a single turn, force a sacrifice from your opponent, pay for itself, and allow you to draw a card.
Gray Merchant of Asphodel is a strong win condition, if you can keep Ayara, First of Locthwain and her fodder alive.
Spawn of Mayhem is a cheap beater, since you will be dealing damage naturally every turn.
Clackbridge Troll's tokens can be wiped by Massacre Wurm. Gimmicky but fun to use.
Call of the Death-Dweller is cheap recovery and allows Serrated Scorpion to be that much more annoying with deathtouch.
Forever Young allows for recovery if you have many creatures in your graveyard, and puts the top card in your hand.
Spark Harvest for clearing out stronger creatures / planeswalkers.
Bastion of Remembrance deals chip damage for every sacrifice, and life gain.
Kaya's Ghostform is cheap recovery that lets you proc Massacre Wurm safely.
Witch's Cottage can recover a creature into your hand, better for later in the game.
