At the beginning of your upkeep, put a spore counter on Deathspore Thallid. Remove three spore counters from Deathspore Thallid: Create a 1/1 green Saproling creature token. Sacrifice a Saproling: Target creature gets -1/-1 until end of turn.
Whenever you cast a creature spell, create X 1/1 black Thrull creature tokens, where X is that spell's mana value. When you control seven or more Thrulls, sacrifice Endrek Sahr, Master Breeder.
Shadow When Faceless Devourer enters, exile another target creature with shadow. When Faceless Devourer leaves the battlefield, return the exiled card to the battlefield under its owner's control.
Enchant creature Enchanted creature has flying and "Sacrifice a creature: This creature gets +2/+1 until end of turn." When Fallen Ideal is put into a graveyard from the battlefield, return Fallen Ideal to its owner's hand.
Flying, trample At the beginning of your upkeep, sacrifice a creature other than Liege of the Pit. If you can't, Liege of the Pit deals 7 damage to you. Morph {B}{B}{B}{B}
Whenever a creature an opponent controls dies, you may pay {1}{B}. If you do, return that card to the battlefield under your control. If it's a creature, it's a Zombie in addition to its other creature types. {1}{B}: Regenerate target Zombie.
Suspend 3—{2}{B}{B} Each player exiles all creature cards from their graveyard, then sacrifices all creatures they control, then puts all cards they exiled this way onto the battlefield.
Flying Whenever Mana Skimmer deals damage to a player, tap target land that player controls. That land doesn't untap during its controller's next untap step.
They traverse the mana-starved wastes in search of richer lands.
Haste Shadow Whenever another creature is put into your graveyard from the battlefield, you may pay {B}. If you do, return Nether Traitor from your graveyard to the battlefield.
First strike When Nightshade Assassin enters, you may reveal X black cards in your hand. If you do, target creature gets -X/-X until end of turn. Madness {1}{B}
When Pit Keeper enters, if you have four or more creature cards in your graveyard, you may return target creature card from your graveyard to your hand.
"The undead are not 'awakened.' They are evicted when there is no room left in the pit for more bodies."