Commander creatures you own have "Whenever an artifact or creature you control is put into a graveyard from the battlefield, each opponent loses 1 life."

Flying

At the beginning of each opponent's end step, that player chooses up to two creatures they control, then sacrifices the rest.

Whenever Ayara, First of Locthwain or another black creature enters the battlefield under your control, each opponent loses 1 life and you gain 1 life.

{T}, Sacrifice another black creature: Draw a card.

Defender

When Barrier of Bones enters the battlefield, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

When Bastion of Remembrance enters the battlefield, create a 1/1 white Human Soldier creature token.

Whenever a creature you control dies, each opponent loses 1 life and you gain 1 life.

Whenever Blood Artist or another creature dies, target player loses 1 life and you gain 1 life.

At the beginning of your upkeep, you may sacrifice Blood Speaker. If you do, search your library for a Demon card, reveal that card, put it into your hand, then shuffle.

Whenever a Demon enters the battlefield under your control, return Blood Speaker from your graveyard to your hand.

At the beginning of each end step, if an opponent lost 2 or more life this turn, you may put a quest counter on Bloodchief Ascension. (Damage causes loss of life.)

Whenever a card is put into an opponent's graveyard from anywhere, if Bloodchief Ascension has three or more quest counters on it, you may have that player lose 2 life. If you do, you gain 2 life.

Bloodsoaked Champion can't block.

Raid -- {1}{B}: Return Bloodsoaked Champion from your graveyard to the battlefield. Activate only if you attacked this turn.

At the beginning of your end step, you may sacrifice an artifact, creature, enchantment, land, or planeswalker. If you do, each opponent may sacrifice a permanent that shares a card type with it. For each opponent who doesn't, that player loses 2 life and you draw a card.

{4}, {T}, Exile Brittle Effigy: Exile target creature.

When Burglar Rat enters the battlefield, each opponent discards a card.

Flying

When Burning-Rune Demon enters the battlefield, you may search your library for exactly two cards not named Burning-Rune Demon that have different names. If you do, reveal those cards. An opponent chooses one of them. Put the chosen card into your hand and the other into your graveyard, then shuffle.

{2}{B}{B}: Exile Carrionette and target creature unless that creature's controller pays {2}. Activate only if Carrionette is in your graveyard.

Clattering Augur can't block.

When Clattering Augur enters the battlefield, you draw a card and you lose 1 life.

{2}{B}{B}: Return Clattering Augur from your graveyard to your hand.

Cult Conscript enters the battlefield tapped.

{1}{B}: Return Cult Conscript from your graveyard to the battlefield. Activate only if a non-Skeleton creature died under your control this turn.

All nonsnow creatures get -X/-X until end of turn, where X is the number of snow permanents you control.

{1}{B}, {T}: Exile two target cards from an opponent's graveyard. Deadeye Tracker explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)

When Demon's Disciple enters the battlefield, each player sacrifices a creature or planeswalker.

Search your library for a card, put that card into your hand, then shuffle.

When Dogged Detective enters the battlefield, surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

Whenever an opponent draws their second card each turn, you may return Dogged Detective from your graveyard to your hand.

At the beginning of your upkeep, you lose 1 life and amass Zombies 1. (Put a +1/+1 counter on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)

Whenever a Zombie token you control with power 6 or greater attacks, it gains lifelink until end of turn.

When Dusk Legion Zealot enters the battlefield, you draw a card and you lose 1 life.

When Elderfang Disciple enters the battlefield, each opponent discards a card.

Destroy target creature or enchantment an opponent controls. You lose life equal to that permanent's mana value.

When Fleshbag Marauder enters the battlefield, each player sacrifices a creature.

Whenever one or more nontoken creatures die, create a 2/2 black Zombie creature token with decayed. This ability triggers only once each turn. (A creature with decayed can't block. When it attacks, sacrifice it at end of combat.)

When Gray Merchant of Asphodel enters the battlefield, each opponent loses X life, where X is your devotion to black. You gain life equal to the life lost this way. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)

Reverberating Summons -- At the beginning of your end step, each opponent loses 2 life. Then for each opponent who has less life than you, create a 1/3 black Demon creature token named Plaguebearer of Nurgle.

Deathtouch

When Guildsworn Prowler dies, if it wasn't blocking, draw a card.

Gutterbones enters the battlefield tapped.

{1}{B}: Return Gutterbones from your graveyard to your hand. Activate only during your turn and only if an opponent lost life this turn.

This spell costs {1} less to cast if an opponent controls no basic lands.

Destroy target creature.

Hagra Broodpit enters the battlefield tapped.

{T}: Add {B}.

{B}: Put target creature card from your graveyard on top of your library.

When Ichor Wellspring enters the battlefield or is put into a graveyard from the battlefield, draw a card.

At the beginning of your end step, if you control no creatures with decayed, create a 2/2 black Zombie creature token with decayed. (It can't block. When it attacks, sacrifice it at end of combat.)

Menace (This creature can't be blocked except by two or more creatures.)

Your opponents can't gain life.

{1}{B}: Knight of Dusk's Shadow gets +1/+1 until end of turn.

Menace

Lieutenant -- At the beginning of combat on your turn, if you control your commander, each opponent loses 3 life.

Choose target creature. You lose 2 life. Until end of turn, that creature gains "When this creature dies, return it to the battlefield tapped under its owner's control."

Malakir Mire enters the battlefield tapped.

{T}: Add {B}.

When Merciless Executioner enters the battlefield, each player sacrifices a creature.

Haste

Shadow (This creature can block or be blocked by only creatures with 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.

When Nimblewright Schematic enters the battlefield or is put into a graveyard from the battlefield, create a 1/1 colorless Construct artifact creature token.

When Novice Occultist dies, you draw a card and you lose 1 life.

Flash

When Omen of the Dead enters the battlefield, return target creature card from your graveyard to your hand.

{2}{B}, Sacrifice Omen of the Dead: Scry 2.

Flying

Order of Midnight can't block.

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Return target creature card from your graveyard to your hand. (Then exile this card. You may cast the creature later from exile.)

At the beginning of your upkeep, if you have four or more creature cards in your graveyard, you may return target creature card from your graveyard to your hand.

As Palace Siege enters the battlefield, choose Khans or Dragons.

• Khans -- At the beginning of your upkeep, return target creature card from your graveyard to your hand.

• Dragons -- At the beginning of your upkeep, each opponent loses 2 life and you gain 2 life.

{2}{B}: Return Persistent Specimen from your graveyard to the battlefield tapped.

When Plaguecrafter enters the battlefield, each player sacrifices a creature or planeswalker. Each player who can't discards a card.

When Prized Statue enters the battlefield or is put into a graveyard from the battlefield, create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

When Ravenous Chupacabra enters the battlefield, destroy target creature an opponent controls.

Flying

Morbid -- At the beginning of each end step, if a creature died this turn, destroy target non-Demon creature.

{1}{B}: Return Reassembling Skeleton from your graveyard to the battlefield tapped.

Flying

When Rune-Scarred Demon enters the battlefield, search your library for a card, put it into your hand, then shuffle.

{2}{B}: Return Sanitarium Skeleton from your graveyard to your hand.

When Servo Schematic enters the battlefield or is put into a graveyard from the battlefield, create a 1/1 colorless Servo artifact creature token.

Flying

When Shadowborn Demon enters the battlefield, destroy target non-Demon creature.

At the beginning of your upkeep, if there are fewer than six creature cards in your graveyard, sacrifice a creature.

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

When Shriekmaw enters the battlefield, destroy target nonartifact, nonblack creature.

Evoke {1}{B} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters the battlefield.)

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+2: Sorin Markov deals 2 damage to any target and you gain 2 life.

-3: Target opponent's life total becomes 10.

-7: You control target player during that player's next turn.

{2}, {T}: Copy target triggered ability you control. You may choose new targets for the copy. (A triggered ability uses the words "when," "whenever," or "at.")

When Tenacious Dead dies, you may pay {1}{B}. If you do, return it to the battlefield tapped under its owner's control.

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)

{T}, Pay 2 life: Remove a counter from target nonland permanent.

Whenever another creature you control dies, Vindictive Vampire deals 1 damage to each opponent and you gain 1 life.

When Virus Beetle enters the battlefield, each opponent discards a card.

Flying

Toxic Spores -- At the beginning of your end step, if a permanent you controlled left the battlefield this turn, each opponent loses 3 life.

(Gain the next level as a sorcery to add its ability.)

At the beginning of your end step, if a creature died this turn, each opponent loses 1 life.

{1}{B}: Level 2

When this Class becomes level 2, look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard.

{6}{B}: Level 3

At the beginning of your end step, each opponent loses life equal to the life they lost this turn. (Damage causes loss of life.)

Deathtouch

At the beginning of your end step, if you gained life this turn, each opponent sacrifices a creature and you return up to one target creature card from your graveyard to your hand.

At the beginning of each end step, each opponent loses life equal to the life they lost this turn. (Damage causes loss of life.)

Whenever Zulaport Cutthroat or another creature you control dies, each opponent loses 1 life and you gain 1 life.