The card centers around Kalitas and Liliana interactions with death. Lots of forcing sacrifices, lots of hand hate,and lots of removal.
Targeted Removal: Ultimate Price, Grasp of Darkness, Ob Nixilis Reignited
Removal through sacrifice: Bearer of Silence, Fleshbag Marauder, Remorseless Punishment, Blighted Fen.
Mass Removal: Languish, Remorseless Punishment
Card Draw: Ob Nixilis Reignited, Read the Bones
Token Generation: Liliana, Heretical Healer Flip, Kalitas, Traitor of Ghet, and Mirrorpool
Hand Hate: Duress, Remorseless Punishment
The way this deck plays out is a slow grind out of interval damage. You have enough removal that any number of small creatures can widdle their life total slowly down. The awesome power of Kalitas, Traitor of Ghet and forced sacrifices will give you an army of zombies to either sac/buff or slowly swarm the enemy.
Erebos's Titan has some serious survivability/evasion given this deck's playstyle. The fact that this card isn't Legendary makes it extra nice.
Fleshbag Marauder is great to flip Liliana, Heretical Healer Flip and can even get another token for Kalitas to sac. Languish can instantly turn the tide if your Kalitas has been buffed even once. The real powerhouse late game is Remorseless Punishment, as if you have kept the board state clear you essentially just wreck an opponant via dmg and hand hate.
Bloodsoaked Champion is a hero here, as he is an easy sac outlet for Fleshbag Marauder because of his graveyard recurrence. He is a keystone piece as a solid one drop that swings in late game board state advantage. This deck has the ability to go from stallig-hell to a go wide strategy literally out of no where and catch people completely off guard.
Remember that this is a control deck, don't overplay your creatures, use them wisely to keep the advantage. Marauders and Bearer of Silence should be held in your hand force the board in your favor, and removal pieces should be used often to keep the opponent from gaining a foothold. Your creatures are expendable pieces to gain incremental advances...don't be afraid to lose them.
This deck is full of fun interactions that can grind out value. One of the more fun ones is with Bloodsoaked Champion and Fleshbag Marauder. Attack with Champion, drop Fleshbag, sac Champion, Raid Champion back on the field. This play gets better when the setup of Liliana, Heretical Healer Flip and/or Kalitas, Traitor of Ghet are on the field.