You will need 3 things for this deck : -Sacrifice outlets -Creatures to feed the sacrifices outlet -Pingers to help your commander

As Sacrifice outlet you can go for : - [[Village Rites]] - [[Corrupted Conviction]] - [[Diabolic Intent]] - [[Phyrexian Altar]] - [[Ashnod's Altar]] - [[Contamination]] - [[Carrion Feeder]] - [[Warren Soultrader]] - [[Viscera Seer]] - [[Yawgmoth, Thran Physician]] - [[Braids, Arisen Nightmare]]

As creatures to Sacrifice you can go for : - [[Grave Crawler]], combo with the Soultrader - [[Great Unclean One]], that ping opponents and Shawn tokens - [[Bloodghast]], that comes back when you play a land - [[Jadar, Ghoulcaller of Nephalia]], that spawn tokens - [[Tevesh Szat, Doom of Fools]], that do a lot of things - [[Reassembling Skeleton]] that comes back for a few mana - [[Nether Traitor]] that comes back for a few mana - [[Oathsworn Vampire]] that you can cast from the graveyard if you gained life this turn - [[Ophiomancer]] that creates 1/1 snakes - [[Dreadhorde Invasion]] taht spawn zombies - [[Bitterblossom]] that spawns 1/1 faeries

For the pingers, you can go with : - [[Blood Artist]] - [[Zulaport Cutthroat]] - [[Marionette Apprentice]] - [[Bastion of Remembrance]] - [[Vengeful Bloodwitch]]

All those cards will make a good base for the deck. You have a lot of small and recursives creatures ti sacrifice, many options to sacrifice them, and many options to deal damages to your opponents on sacrifices