Ayara, First of Locthwain - nice at draining your opponent of life. You can do this either by casting creatures or by simply summoning them from the graveyard. The draw sacrifice/draw ability is very good at keeping a steady stream of cards in your hand. Works well with Grim Haruspex.
Cadaver Imp - great early creature retrieval. The Imp acts as a chump blocker that can also defend against flying. Works with Cavalier of Nigh.
Cavalier of Night - versatile attacker/blocker. Lifelink is a nice feature. Great ability to remove a single threat (the sacrificing can also be in your favor). You gain benefits even when this creature dies.
Deathbringer Regent - acts as a boardwipe. Is also a large flying smasher.
Deathgreeter - early creature drop. Makes all the destruction on the battlefield beneficial to you. Having multiple on the field makes lifegain crazy.
Doomed Necromancer - easy way to cheat creatures into play, even on your opponent's turn. Can Works well with Cavalier of Night and Liliana, Defient Necromancer.
Dreadmalkin - Early creature drop that can gain power quite quickly.
Grave Titan - powerful creature that can take a chunk out of your opponents life points. The zombie spawning ability works nicely with Ayara, First of Locthwain.
Grim Haruspex - makes sacrifice worthwhile. Having multiple down means that you will never run out of cards.
Liliana, Heretical Healer
- a very effective creature/planeswalker. It's first planeswalker ability makes it easy to cheat expensive creatures into play. The second ability is yet another rivival ability that works in tandem with its first ability as well as any other sacrificing abilities. The third ability doesn't necessarily win you the game outright, but will certainly increase your chances. The nice thing about this planeswalker is that it can returned from the dead with creature revival.
Perilous Myr - this creature is great to sacrifice when your opponent has a creature that needs to be killed. Otherwise, it is a good chump blocker and deals damage to your opponent or your opponent's planeswalkers.
Reiver Demon - similar to Deathbringer Regent in function. This boardwipe creature will spare your own creatures.
Shriekmaw - acts as an early killspell that can be reused with creature revival. Rarley is it played for its actual mana cost.
Sidisi, Undead Vizier - Good for searching up cards that you need. If you sacrifice Sidisi to his own ability he be reused with creature revival.
Viscera Seer - a cheap creature with an amazing ability. The sacrificing ability is great because it requires no additional cost other than that of a creature. Thi ability not only helps with getting cards that you need but also makes it difficult to target your creatures with spells and abilities. Combos nicely with Grim Haruspex.
Bontu's Monument - Similar effect to Ayara. Both cards can combine to deal lethal damage every time you play a creature. The passive ability that reduces creature cost is a very nice feature. This will help with either playing expensive creatures on earlier turns, or playing several cheap creatures together.
Cabal Stronghold - can amass you mana quite well.
Westvale Abbey
- a useful land that can transform into a devastating demon. Sacrificing five creatures is steep, but there are plenty of small cheap costing creatures in this deck.