Carrion Feeder - As a central combo piece of the deck, Carrion Feeder is integral to the deck's identity. It also serves as a decent attacker as well; since it can't block, it's a freebie on an open board. Carrion Feeder also has the effect of being able to tuck away our cards in response to removal, particularly exile cards like Prismatic Ending that our deck can often be weak to. It can also be an effective pairing with Stitcher's Supplier.
Champion of the Perished - Champion of the Perished leans into the Zombie tribal aspect of our deck, and is probably the best t1 drop besides Stitcher's Supplier that we have. As said previously, it can be a minor payoff for our infinite combo as well, becoming infinite along with our Feeder. 68% of the creatures in our deck are Zombies so it really shouldn't fizzle (especially if you're keeping an optimal hand).
Cryptbreaker - Cryptbreaker in this deck serves as a chump blocker, chump blocker generator, racker for our combo pieces, and card draw engine. It's a very good card in the deck, serving a variety of purposes, and unlike Undead Augur it does not run the risk of killing us. It also has the advantage of being a t1 drop, though usually a different Zombie is better for this task. My favorite part about Cryptbreaker is that its ability innately ignores summoning sickness, so you can play your Gravecrawlers and immediately get value from them.
Diabolic Intent - If we're missing a combo piece, eating a Gravecrawler or Stitcher's Supplier to cast this is usually not difficult. Plus, unlike Mausoleum Secrets it can grab a Pitiless Plunderer.
Disciple of the Vault - serves as a cheaper payoff for our combo, as it triggers off each Treasure.
Gravecrawler - This card pops off regularly, not only as an aggressive attacker and combo piece, but also fodder for sacrificing and direct advantage off Stitcher's Supplier's milling. It can't block, so again you're not losing anything if you tap it with Cryptbreaker or run it off on an empty board.
Pitiless Plunderer - This card is the clunky gear of the deck. Costing 4 mana, it can't be hit by Unearth, and it isn't a Zombie so it doesn't advantage us in a whole lot of scenarios. However, it does have a lot of intrinsic advantages that make it worth playing, including being an essential combo piece and giving us mana for our spells.
Stitcher's Supplier - This card is in this deck solely to enable reanimator strategies, which gives us a form of pseudo-card advantage. It's especially good in Plunderer-Feeder hands or Feeder-Persist hands, where we're missing a combo piece that can easily be fetched from the graveyard. It has the advantage of comboing well with Feeder and Gravecrawler.
Zulaport Cutthroat - Zulaport Cutthroat is the final creature of this deck and similarly to Disciple of the Vault it serves as a great payoff for our infinite combo.