You can't win the game and your opponents can't lose the game.
6 /
6
{4}{W}
Ancestor's Prophet
Creature - Human Cleric
Tap five untapped Clerics you control: You gain 10 life.
1 /
5
{3}{W}
Angelic Accord
Enchantment
At the beginning of each end step, if you gained 4 or more life this turn, create a 4/4 white Angel creature token with flying.
{3}{B}{B}
Archfiend of Depravity
Creature - Demon
Flying
At the beginning of each opponent's end step, that player chooses up to two creatures they control, then sacrifices the rest.
5 /
4
{W}{B}
Ayli, Eternal Pilgrim
Legendary Creature - Kor Cleric
Deathtouch
{1}, Sacrifice another creature: You gain life equal to the sacrificed creature's toughness.
{1}{W}{B}, Sacrifice another creature: Exile target nonland permanent. Activate only if you have at least 10 life more than your starting life total.
2 /
3
{3}{B}{B}
Black Market
Enchantment
Whenever a creature dies, put a charge counter on Black Market.
At the beginning of your precombat main phase, add {B} for each charge counter on Black Market.
{3}{B}
Blood Speaker
Creature - Ogre Shaman
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.
3 /
2
--
Cabal Stronghold
Land
{T}: Add {C}.
{3}, {T}: Add {B} for each basic Swamp you control.
--
Command Tower
Land
{T}: Add one mana of any color in your commander's color identity.
{3}
Commander's Sphere
Artifact
{T}: Add one mana of any color in your commander's color identity.
Sacrifice Commander's Sphere: Draw a card.
{3}{B}
Crypt Ghast
Creature - Spirit
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.)
Whenever you tap a Swamp for mana, add an additional {B}.
2 /
2
{3}
Darksteel Ingot
Artifact
Indestructible
{T}: Add one mana of any color.
{1}{W}
Darksteel Mutation
Enchantment - Aura
Enchant creature
Enchanted creature is an Insect artifact creature with base power and toughness 0/1 and has indestructible, and it loses all other abilities, card types, and creature types.
{6}{B}{B}{B}
Demon of Death's Gate
Creature - Demon
You may pay 6 life and sacrifice three black creatures rather than pay this spell's mana cost.
Flying, trample
9 /
9
{2}{B}{B}
Desecration Demon
Creature - Demon
Flying
At the beginning of each combat, any opponent may sacrifice a creature. If a player does, tap Desecration Demon and put a +1/+1 counter on it.
6 /
6
{W}{B}
Despark
Instant
Exile target permanent with mana value 4 or greater.
{2}{W}
Devout Chaplain
Creature - Human Cleric
{T}, Tap two untapped Humans you control: Exile target artifact or enchantment.
2 /
2
{1}{W}{B}
Edgewalker
Creature - Human Cleric
Cleric spells you cast cost {W}{B} less to cast. This effect reduces only the amount of colored mana you pay. (For example, if you cast a Cleric spell with mana cost {1}{W}, it costs {1} to cast.)
2 /
2
{2}{W}
Expose to Daylight
Instant
Destroy target artifact or enchantment. Scry 1.
{2}{W}{W}
False Prophet
Creature - Human Cleric
When False Prophet dies, exile all creatures.
2 /
2
{2}{W}
Frontline Medic
Creature - Human Cleric
Battalion -- Whenever Frontline Medic and at least two other creatures attack, creatures you control gain indestructible until end of turn.
Sacrifice Frontline Medic: Counter target spell with {X} in its mana cost unless its controller pays {3}.
3 /
3
{3}{W}{W}
Fumigate
Sorcery
Destroy all creatures. You gain 1 life for each creature destroyed this way.
{2}{W}
Ghostly Prison
Enchantment
Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.
{W}{W}
Grand Abolisher
Creature - Human Cleric
During your turn, your opponents can't cast spells or activate abilities of artifacts, creatures, or enchantments.
2 /
2
{3}{B}{B}
Gray Merchant of Asphodel
Creature - Zombie
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.)
2 /
4
{1}{W}
Hanweir Militia Captain
Creature - Human Soldier
At the beginning of your upkeep, if you control four or more creatures, transform Hanweir Militia Captain.
2 /
2
--
Westvale Cult Leader
Creature - Human Cleric
Westvale Cult Leader's power and toughness are each equal to the number of creatures you control.
At the beginning of your end step, create a 1/1 white and black Human Cleric creature token.
2 /
2
{4}{B}{B}
Harvester of Souls
Creature - Demon
Deathtouch
Whenever another nontoken creature dies, you may draw a card.
5 /
5
{4}
Hedron Archive
Artifact
{T}: Add {C}{C}.
{2}, {T}, Sacrifice Hedron Archive: Draw two cards.
{W}{B}
High Priest of Penance
Creature - Human Cleric
Whenever High Priest of Penance is dealt damage, you may destroy target nonland permanent.
1 /
1
{3}{B}{B}
Indulgent Tormentor
Creature - Demon
Flying
At the beginning of your upkeep, draw a card unless target opponent sacrifices a creature or pays 3 life.
5 /
3
{2}
Mind Stone
Artifact
{T}: Add {C}.
{1}, {T}, Sacrifice Mind Stone: Draw a card.
{1}{W}{B}
Mortify
Instant
Destroy target creature or enchantment.
{1}{B}
Night's Whisper
Sorcery
You draw two cards and you lose 2 life.
{3}{B}{B}
Ob Nixilis of the Black Oath
Legendary Planeswalker - Nixilis
+2: Each opponent loses 1 life. You gain life equal to the life lost this way.
-2: Create a 5/5 black Demon creature token with flying. You lose 2 life.
-8: You get an emblem with "{1}{B}, Sacrifice a creature: You gain X life and draw X cards, where X is the sacrificed creature's power."
Ob Nixilis of the Black Oath can be your commander.
L:
3
{3}
Oketra's Monument
Legendary Artifact
White creature spells you cast cost {1} less to cast.
Whenever you cast a creature spell, create a 1/1 white Warrior creature token with vigilance.
{3}
Orzhov Cluestone
Artifact
{T}: Add {W} or {B}.
{W}{B}, {T}, Sacrifice Orzhov Cluestone: Draw a card.
{4}{W}{W}
Phyrexian Rebirth
Sorcery
Destroy all creatures, then create an X/X colorless Phyrexian Horror artifact creature token, where X is the number of creatures destroyed this way.
{2}{W}
Pious Evangel
Creature - Human Cleric
Whenever Pious Evangel or another creature enters the battlefield under your control, you gain 1 life.
{2}, {T}, Sacrifice another permanent: Transform Pious Evangel.
2 /
2
--
Wayward Disciple
Creature - Human Cleric
Whenever Wayward Disciple or another creature you control dies, target opponent loses 1 life and you gain 1 life.
2 /
2
{3}{B}
Pitiless Plunderer
Creature - Human Pirate
Whenever another creature you control dies, create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")
1 /
4
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
{3}
Pristine Talisman
Artifact
{T}: Add {C}. You gain 1 life.
{2}{W}
Rally for the Throne
Instant
Create two 1/1 white Human creature tokens.
Adamant -- If at least three white mana was spent to cast this spell, you gain 1 life for each creature you control.
{2}{B}
Read the Bones
Sorcery
Scry 2, then draw two cards. You lose 2 life.
{3}{B}{B}{B}
Reaper from the Abyss
Creature - Demon
Flying
Morbid -- At the beginning of each end step, if a creature died this turn, destroy target non-Demon creature.
6 /
6
{1}{B}
Reassembling Skeleton
Creature - Skeleton Warrior
{1}{B}: Return Reassembling Skeleton from your graveyard to the battlefield tapped.
1 /
1
{4}{B}{B}
Reign of the Pit
Sorcery
Each player sacrifices a creature. Create an X/X black Demon creature token with flying, where X is the total power of the creatures sacrificed this way.
{W/B}{W/B}{ // }{4}{W}{B}
Revival // Revenge
Sorcery // Sorcery
Return target creature card with mana value 3 or less from your graveyard to the battlefield.
Double your life total. Target opponent loses half their life, rounded up.
{2}{B}{B}
Rite of Belzenlok
Enchantment - Saga
(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II -- Create two 0/1 black Cleric creature tokens.
III -- Create a 6/6 black Demon creature token with flying, trample, and "At the beginning of your upkeep, sacrifice another creature. If you can't, this creature deals 6 damage to you."
{3}{B}{B}
Sanguine Bond
Enchantment
Whenever you gain life, target opponent loses that much life.
--
Scoured Barrens
Land
Scoured Barrens enters the battlefield tapped.
When Scoured Barrens enters the battlefield, you gain 1 life.
{T}: Add {W} or {B}.
{3}{B}
Sengir Autocrat
Creature - Human
When Sengir Autocrat enters the battlefield, create three 0/1 black Serf creature tokens.
When Sengir Autocrat leaves the battlefield, exile all Serf tokens.
2 /
2
{1}{B}
Shadows of the Past
Enchantment
Whenever a creature dies, scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)
{4}{B}: Each opponent loses 2 life and you gain 2 life. Activate only if there are four or more creature cards in your graveyard.
{B}{B}
Sign in Blood
Sorcery
Target player draws two cards and loses 2 life.
{1}{B}
Skirsdag High Priest
Creature - Human Cleric
Morbid -- {T}, Tap two untapped creatures you control: Create a 5/5 black Demon creature token with flying. Activate only if a creature died this turn.
1 /
2
{3}{W}
Smothering Tithe
Enchantment
Whenever an opponent draws a card, that player may pay {2}. If the player doesn't, you create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")
{1}
Sol Ring
Artifact
{T}: Add {C}{C}.
{W}
Soul Warden
Creature - Human Cleric
Whenever another creature enters the battlefield, you gain 1 life.
1 /
1
{W}{B}{B}
Souls of the Faultless
Creature - Spirit
Defender (This creature can't attack.)
Whenever Souls of the Faultless is dealt combat damage, you gain that much life and attacking player loses that much life.
0 /
4
{1}{W}
Suture Priest
Creature - Phyrexian Cleric
Whenever another creature enters the battlefield under your control, you may gain 1 life.
Whenever a creature enters the battlefield under an opponent's control, you may have that player lose 1 life.
1 /
1
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
{W}
Swords to Plowshares
Instant
Exile target creature. Its controller gains life equal to its power.
--
Tainted Field
Land
{T}: Add {C}.
{T}: Add {W} or {B}. Activate only if you control a Swamp.
{2}
Talisman of Hierarchy
Artifact
{T}: Add {C}.
{T}: Add {W} or {B}. Talisman of Hierarchy deals 1 damage to you.
{4}{B}
The Eldest Reborn
Enchantment - Saga
(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I -- Each opponent sacrifices a creature or planeswalker.
II -- Each opponent discards a card.
III -- Put target creature or planeswalker card from a graveyard onto the battlefield under your control.
{1}{W}{W}
Thraben Doomsayer
Creature - Human Cleric
{T}: Create a 1/1 white Human creature token.
Fateful hour -- As long as you have 5 or less life, other creatures you control get +2/+2.
2 /
2
{3}{B}
Tree of Perdition
Creature - Plant
Defender
{T}: Exchange target opponent's life total with Tree of Perdition's toughness.
0 /
13
{1}{B}{B}
Underworld Connections
Enchantment - Aura
Enchant land
Enchanted land has "{T}, Pay 1 life: Draw a card."
{W/B}{W/B}{W/B}
Unmake
Instant
Exile target creature.
{2}{W}{B}
Utter End
Instant
Exile target nonland permanent.
{2}{B}
Victimize
Sorcery
Choose two target creature cards in your graveyard. Sacrifice a creature. If you do, return the chosen cards to the battlefield tapped.
{5}{B}{B}{B}
Vilis, Broker of Blood
Legendary Creature - Demon
Flying
{B}, Pay 2 life: Target creature gets -1/-1 until end of turn.
Whenever you lose life, draw that many cards. (Damage causes loss of life.)
8 /
8
{W}{B}
Vizkopa Guildmage
Creature - Human Wizard
{1}{W}{B}: Target creature gains lifelink until end of turn.
{1}{W}{B}: Whenever you gain life this turn, each opponent loses that much life.
2 /
2
{4}
Well of Lost Dreams
Artifact
Whenever you gain life, you may pay {X}, where X is less than or equal to the amount of life you gained. If you do, draw X cards.
--
Westvale Abbey
Land
{T}: Add {C}.
{5}, {T}, Pay 1 life: Create a 1/1 white and black Human Cleric creature token.
{5}, {T}, Sacrifice five creatures: Transform Westvale Abbey, then untap it.
--
Ormendahl, Profane Prince
Legendary Creature - Demon
Flying, lifelink, indestructible, haste
{1}{B}
Zulaport Cutthroat
Creature - Human Rogue Ally
Whenever Zulaport Cutthroat or another creature you control dies, each opponent loses 1 life and you gain 1 life.