★★★★★ Bloodghast: A resilient 2/1 that can keep on coming back from the dead, works very well with Lashwrithe, and is a staple within Mono-black Devotion lists. However against a very aggressive meta it might be better to pick a creature that can actually block.
★ Altar's Reap: Sees extreme fringe play in decks that are sacrifice based as card draw.
★★★ Heartless Summoning: You could build around this card, and have success with it, as this card allows some combos, such as an infinite loop combo with 2 Myr Retriever and Altar of the Brood, as well as just playing cards like Myr Superion and Spellskite for free. Heartless also allows you to take advantage of high CMC cards like Kalitas, Traitor of Ghet, Abyssal Persecutor, Gray Merchant of Asphodel, and maybe even cards like Grave Titan.
★★★ Spellskite: Spellskite is an infect hoser that thanks to WOTC can be played in all colors, this card works well against decks that would rather like to hose you like Bogles or Shadow Zoo, but doesn't see any real play in mono black.
★★ Guardian Idol/Mind Stone: These cards only see play in lists that abuse Death Cloud to make sure you net more mana than your opponent.
★★★ Feed the Swarm: Definitely a sideboard card, and a fantastic option against enchantments. The unfortunate reality is that there just aren't too many of those lists in modern. If an enchatnment deck ever becomes tier 1, this will move up in utility.
★★★ Scourge of the Skyclaves: Amazing in aggressive lists (usually Red/Black) that can blow out the opponent's life total. It isn't quite so good in Mono-Black, but maybe in the future this card will be awesome.
★★★★ Bitterblossom: This card has variable play. Against fair decks, you allow yourself to get down a creature every turn, which is great when you have equipment to power the tokens up. Blossom also works very well against opposing liliana's as making us sac tokens doesn't get them very far. The issues are that like Phyrexian Arena it can be the death of you, and it doesn't do anything the turn you play it.
★ Dragon's Claw: Fringe piece, Only even decent against burn, but in reality cards like Gifted Aetherborn are typically more effective.
★★★ Kalastria Highborn: Commonly seen in Mono-black Vampires, Highborn turns your vampires into little Syphon Lifes when they die if you have open mana.
★★★ Stromkirk Condemned: Another card seen in Mono-Black Vampires, Condemned is great at acting like a pseudo-lord for vampires since you can pitch a swamp to pump your team.
★★ Zombie Infestation/Call the Bloodline: Fringe pieces. Played in lists that want to throw away their hand. See play in some janky Madness lists.
★★★ Hand of Cruelty/Black Knight/Stromgald Crusader/Knight of Malice: These two drops are strong enough to hold off a few of the fast creatures in the format, crusader can be more effective in the late game with Lashwrithe. Hand of Cruelty is the strongest tempo card as it is basically a 3/3 when attacking or blocking. However, these creatures were pretty outclassed when Gifted Aetherborn was printed.
★★★★ Brain Maggot/★★★★Kitesail Freebooter: These creatures are discard spells on bodies. Both of them have their advantages. Maggot is usually played as a turn 2 discard spell, and Freebooter is usually used for a Duress like effect while adding devotion for Gray Merchant of Asphodel.
★★★★ Rite of Consumption/Severed Strands: A card that can provide decent lifegain against decks like burn, as well as being able to kill your own Abyssal Persecutor when you need to, since even if your opponent were to counter your spell. your creature is dead anyway.
★★ Imp's Mischief: Fringe Piece. This card is pretty much sideboard only, because the only cards we'd want to be redirecting here are removal spells, and maybe the occasional counter-combo piece if Splinter Twin ever gets unbanned.
★★★★★ Gifted Aetherborn: A Vampire Nighthawk that had it's mana cost cut by 1 in return for clipping it's wings, Gifted aetherborn essentially allows us to play Vampire Nighthawk without having to play it on turn 3, since you almost never wanted to play it on turn 3 anyways. It's a great card and sees a lot of play in mono-black decks.
★★★★★ Damping Sphere: A new power card, sphere gives us hate for Tron & Storm decks without the need for extra sideboard pieces.
★★ Graveyard Marshal: A new zombie 2-drop, Marshal is basically a weaker Relentless Dead, except it has the potential to make more tokens. This card isn't the most efficient, but it could prove decent in a budget zombie deck.
★★★★★ Dark Confidant: A very flavorful card, Dark Confidant sees play in many midrange and aggro builds with a lower cmc concentration to allow feverous card draw on a 2/1 body. The main issue of this card is that it eats all removal spells and can easily kill you if your cmc is on the high end. Played as a 2-4 if used.
★★★★ Devour Flesh/Geth's Verdict: Both of these spells make a player sacrifice a creature, and have different uses, as verdict is the more aggressive of the two, but you can use devour on yourself to gain life if you want. These budget cards usually see play in metas with decks like Bogles.
★★★ Asylum Visitor/Blood Scrivener/Other bad bobs: These cards are usually favorable on a budget, and in some builds they function like Phyrexian Arena.
★★★ Sangrophage: The black version of Kalonian Tusker, Sangrophage is played primarily in Suicide black aggro decks as an aggressive early game threat.
★★★★ Wrench Mind: The more modern version of Hymn to Tourach, sees play in discard heavy lists like 8-rack.
★★★ Distress: A Thoughtseizelike effect played on turn 2, seen in budget lists.
★★★★ Relentless Dead: Often seen in Mono-black deovtion, Relentless dead is a recursive creature that can bring back other dead zombies from your graveyard.
★★ Treacherous Pit-Dweller: Played in some suicide black lists, Pit dweller can be an outstanding threat, but the problem is that of course it can become an even bigger threat for an opponent as well.
★★★ Nantuko Shade: Shade can be a mana sink that's great when you aren't doing anything, but can fall kind flat against most other threats in the format in the early game.
★★★ Waste Not: Often a sideboard card in decks like 8-rack, Waste not can function as a multipurpose tool to help you in a variety of situations.
★ Dash Hopes: This card only sees play in aggressive lists like suicide black, as since mono-black usually isn't great at pressuring the opponent at a fast rate, this card doesn't give much edge against decks like control or combo.
★ Hunted Horror: A fringe secret weapon to be used against decks that use Leyline of Sanctity, since they can't be the target of spells or abilities, you can't give them their precious centaurs they deserve. How Sad :) This card also works with decks that abuse Torpor Orb.
★★★★ Ratchet Bomb: One of the few ways mono-black can deal with non-creature heavy decks, it is rather slow but it can be effective in the sideboard.
★★★Go for the Throat/★★★★★Victim of Night/★★★Doom Blade/★★★Cast Down/★★★★★Heartless Act: Our 2 cmc cost conditional removal spells. Go for the throat is bad against affinity and tron, but works against most other decks. Victim of Night is the least conditional removal spell in the format for mono-black, as besides Kalitas, Traitor of Ghet, Bloodghast, Prized Amalgam, and Gurmag Angler, they are no other real vampires/zombies/werewolves in the format. Doom Blade is a classic removal spell that has shrunk in play because plenty of decks run black these days. Cast down is effective against most creatures, but against certain strategies you may want another card. Heartless Act is great unless someone has a counter strategy.
★★★Devour in Shadow: The true mono-black Terminate, Devour in Shadow can destroy any creature, provided you pay the price. Seen in some suicide black lists.
★★★ Bile Blight: An outstanding card against decks that play Lingering Souls, also works against decks like burn and whatnot as a way to deal with decks that play lots of the same creature.
★★★★ Gatekeeper of Malakir: Although technically a 2-drop, Gatekeeper is almost always played as a 3 drop, as removal on a body is always good. This card is sort of meta dependent but is commonly seen in mono black decks.
★★Sign in Blood/★★Night's Whisper: Fringe pieces. Okay card draw, seen in some control builds.
★★★★★ Collective Brutality: This card is exceptionally good, as it supplies all kinds of advantages while only costing you 2 mana, very good against burn.
★★★★ Defense Grid: Colorless anti-control card, usually seen as a 2-of in the sideboard if used.
★★★★★ Pack Rat: Pack rat is a powerful two-drop that can quickly take over the board and if not answered, can win you games. Rat also lets you advance your board if you get stuck on 3 mana or keep drawing lands. It should be noted that since the ability makes token copies and not just tokens, the tokens can contribute devotion to Gray Merchant of Asphodel and other devotion pieces.
★★ Withered Wretch: Can be used as gravehate if relevant.
★★★ Smother: Kills a large amount of creatures in the format, but has been basically replaced with Fatal Push and Victim of Night.
★★ Shadow of Doubt: Played sometimes as a one-of to "get" decks like Tron and Scaepshift by tricking them into playing their Scapeshifts or Expedition Maps. This card is really more of a meta call.
★★ Mortarpod: Sees fringe play in mono-black midrange, usually seen in decks that run Abyssal Persecutor as a way to end the game once you have it.
★ Shred Memory: A fringe peice. A slight ammount of gravehate, but almost always used for it's transmute effect to tutor for combo pieces. Dimir House Guard and Dimir Machinations function similarly for trasmuting.
★★★ Augur of Skulls: Played in some variants of 8-rack, and fringe play in other mono-black decks.
★★★★ Smallpox: Gives the deck a "Pox" feel, Smallpox is probably one of the best cards you can use turn 2 on the play.
★★ Nameless Inversion: Combos with Haakon, Stromgald Scourge, Nameless inversion also works well in any deck trying to achieve delirium.