When Abyssal Gatekeeper dies, each player sacrifices a creature.

{T}: Add one mana of any color in your commander's color identity.

Target player mills two cards, draws two cards, and loses 2 life. (To mill a card, a player puts the top card of their library into their graveyard.)

Barren Moor enters the battlefield tapped.

{T}: Add {B}.

Cycling {B} ({B}, Discard this card: Draw a card.)

Flash

Enchant creature

At the beginning of your upkeep, you lose 1 life.

{0}: Regenerate enchanted creature.

Bojuka Bog enters the battlefield tapped.

When Bojuka Bog enters the battlefield, exile target player's graveyard.

{T}: Add {B}.

Put any number of target creature cards from your graveyard on top of your library.

Draw a card at the beginning of the next turn's upkeep.

When Bronze Walrus enters the battlefield, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

{T}: Add one mana of any color.

At the beginning of your end step, if you descended this turn, create a 1/1 black Fungus creature token with "This creature can't block." (You descended if a permanent card was put into your graveyard from anywhere.)

Animate Chains -- When Chain Devil enters the battlefield, each player sacrifices a nontoken creature.

Charcoal Diamond enters the battlefield tapped.

{T}: Add {B}.

Clay Revenant enters the battlefield tapped.

{2}{B}: Return Clay Revenant from your graveyard to your hand.

As an additional cost to cast this spell, sacrifice a creature.

Draw two cards.

{X}: Crypt Rats deals X damage to each creature and each player. Spend only black mana on X.

Enchant creature

Enchanted creature gets +1/+1.

Sacrifice a creature: Regenerate enchanted creature.

Return X target creature cards from your graveyard to your hand.

Target creature gets -1/-1 until end of turn for each Swamp you control.

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

Desert of the Glorified enters the battlefield tapped.

{T}: Add {B}.

Cycling {1}{B} ({1}{B}, Discard this card: Draw a card.)

Casualty 1 (As you cast this spell, you may sacrifice a creature with power 1 or greater. When you do, copy this spell.)

Mill two cards, then you may return a creature card from your graveyard to your hand. (To mill a card, put the top card of your library into your graveyard.)

Return target creature card from your graveyard to the battlefield.

Flashback--Sacrifice three creatures. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Multikicker {2} (You may pay an additional {2} any number of times as you cast this spell.)

Everflowing Chalice enters the battlefield with a charge counter on it for each time it was kicked.

{T}: Add {C} for each charge counter on Everflowing Chalice.

When Exquisite Huntmaster dies, create a 1/1 green Elf Warrior creature token.

Encore {4}{B} ({4}{B}, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery.)

Flying

Whenever Eye Collector deals combat damage to a player, each player mills 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.

Put any number of target creature cards from your graveyard on top of your library.

Draw a card.

Put any number of target creature cards from your graveyard on top of your library.

Draw a card.

Flash

Enchant creature

Enchanted creature gets +2/+0.

When enchanted creature dies, return it to the battlefield tapped under its owner's control.

Swampcycling {2} ({2}, Discard this card: Search your library for a Swamp card, reveal it, put it into your hand, then shuffle.)

Backup 2 (When this creature enters the battlefield, put two +1/+1 counters on target creature. If that's another creature, it gains the following ability until end of turn.)

Menace

Put any number of target creature cards from your graveyard on top of your library.

Draw a card.

When Haunt of the Dead Marshes enters the battlefield, scry 1.

{2}{B}: Return Haunt of the Dead Marshes from your graveyard to the battlefield tapped. Activate only if you control a legendary creature.

{T}: Add {C}.

{3}, {T}, Sacrifice Haunted Fengraf: Return a creature card at random from your graveyard to your hand.

{T}: Add {C}. ({C} represents colorless mana.)

Hidden Necropolis enters the battlefield tapped.

{T}: Add {B}.

{4}{B}, {T}, Sacrifice Hidden Necropolis: Discover 4. Activate only as a sorcery. (Exile cards from the top of your library until you exile a nonland card with mana value 4 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)

Whenever you cycle or discard another card, Horror of the Broken Lands gets +2/+1 until end of turn.

Cycling {B} ({B}, Discard this card: Draw a card.)

When Injector Crocodile dies, incubate 3. (Create an Incubator token with three +1/+1 counters on it and "{2}: Transform this artifact." It transforms into a 0/0 Phyrexian artifact creature.)

Swampcycling {2} ({2}, Discard this card: Search your library for a Swamp card, reveal it, put it into your hand, then shuffle.)

Enchant creature or planeswalker you control

When enchanted permanent dies or is put into exile, return that card to the battlefield under your control.

{1}, Sacrifice a creature: Each opponent loses 1 life and you gain 1 life.

{T}: Add {B}.

Cycling {B} ({B}, Discard this card: Draw a card.)

{T}: Add {C}.

{T}: Add {C}.

{1}, {T}, Sacrifice Mind Stone: Draw a card.

Flying

At the beginning of combat on your turn, each player mills three cards.

{1}{B}, Sacrifice Moriok Replica: You draw two cards and you lose 2 life.

Mortuary Mire enters the battlefield tapped.

When Mortuary Mire enters the battlefield, you may put target creature card from your graveyard on top of your library.

{T}: Add {B}.

Until end of turn, target creature you control gains "When this creature dies, return it to the battlefield tapped under its owner's control, then create a Wicked Role token attached to it." (Enchanted creature gets +1/+1. When this Aura is put into a graveyard, each opponent loses 1 life.)

Flying

{T}: Add one mana of any color.

This spell costs {1} less to cast for each creature card in your graveyard.

Exile target creature or planeswalker.

Peat Bog enters the battlefield tapped with two depletion counters on it.

{T}, Remove a depletion counter from Peat Bog: Add {B}{B}. If there are no depletion counters on Peat Bog, sacrifice it.

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

At the beginning of the end step, if no creatures are on the battlefield, sacrifice Pestilence.

{B}: Pestilence deals 1 damage to each creature and each player.

Polluted Mire enters the battlefield tapped.

{T}: Add {B}.

Cycling {2} ({2}, Discard this card: Draw a card.)

{T}: Add {C}.

{1}, {T}: Add one mana of any color.

When Rampaging Spiketail enters the battlefield, target creature you control gets +2/+0 and gains indestructible until end of turn.

Swampcycling {2} ({2}, Discard this card: Search your library for a Swamp card, reveal it, put it into your hand, then shuffle.)

Return target creature card from your graveyard to your hand.

Storm (When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies.)

When Returned Reveler dies, each player mills three cards.

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

{T}: Surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

When Slum Reaper enters the battlefield, each player sacrifices a creature.

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

Star Compass enters the battlefield tapped.

{T}: Add one mana of any color that a basic land you control could produce.

Flying

Whenever Stinkweed Imp deals combat damage to a creature, destroy that creature.

Dredge 5 (If you would draw a card, you may mill five cards instead. If you do, return this card from your graveyard to your hand.)

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Cycling--Pay 2 life. (Pay 2 life, Discard this card: Draw a card.)

Each other player discards a card. You draw a card for each card discarded this way.

Whenever another creature dies, or a creature card is put into a graveyard from anywhere other than the battlefield, or a creature card leaves your graveyard, Syr Konrad, the Grim deals 1 damage to each opponent.

{1}{B}: Each player mills a card. (They each put the top card of their library into their graveyard.)

The Dross Pits enters the battlefield tapped.

{T}: Add {B}.

{1}{B}, {T}, Sacrifice The Dross Pits: Draw a card.

{T}: Add {C}.

{3}, {T}: Surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

{B}, Discard a creature card: Return target creature card from your graveyard to your hand.

Troll of Khazad-dûm can't be blocked except by three or more creatures.

Swampcycling {1} ({1}, Discard this card: Search your library for a Swamp card, reveal it, put it into your hand, then shuffle.)

{T}: Create a Treasure token. Activate only if a creature died this turn. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

{B}, {T}, Discard a card: Return target creature card from your graveyard to your hand.

Until end of turn, target creature gains "When this creature dies, return it to the battlefield tapped under its owner's control with a +1/+1 counter on it."

Each player mills three cards. Then you return up to two creature cards from your graveyard to your hand. (To mill three cards, a player puts the top three cards of their library into their graveyard.)

{T}: Add {C}. If you control an Urza's Power-Plant and an Urza's Tower, add {C}{C} instead.

{T}: Add {C}. If you control an Urza's Mine and an Urza's Tower, add {C}{C} instead.

{T}: Add {C}. If you control an Urza's Mine and an Urza's Power-Plant, add {C}{C}{C} instead.

{T}, Sacrifice another creature: Each opponent loses 2 life and you gain 2 life.

As an additional cost to cast this spell, sacrifice a creature.

Draw two cards.

Cycling {2} ({2}, Discard this card: Draw a card.)

Unearth {1}{B} ({1}{B}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Sacrifice a creature: Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)

Flying

Exploit (When this creature enters the battlefield, you may sacrifice a creature.)

When Vulturous Aven exploits a creature, you draw two cards and you lose 2 life.

({T}: Add {B}.)

Witch's Cottage enters the battlefield tapped unless you control three or more other Swamps.

When Witch's Cottage enters the battlefield untapped, you may put target creature card from your graveyard on top of your library.