Marrow-Gnawer - Built around Piper of the Swarm, Pack Rat and Ogre Slumlord

Piper of the Swarm

Creature — Human Warlock

$1.35

Rats you control have menace. {1}{B}, {T}: Create a 1/1 black Rat creature token. {2}{B}{B}, {T}, Sacrifice three Rats: Gain control of target creature.

Pack Rat

Creature — Rat

$2.51

Pack Rat's power and toughness are each equal to the number of Rats you control. {2}{B}, Discard a card: Create a token that's a copy of this creature.

Ogre Slumlord

Creature — Ogre Rogue

$0.3

Whenever another nontoken creature dies, you may create a 1/1 black Rat creature token. Rats you control have deathtouch.

Karumonix, the Rat King

Legendary Creature — Phyrexian Rat

$0.89

Toxic 1 (Players dealt combat damage by this creature also get a poison counter.) Other Rats you control have toxic 1. When Karumonix enters, look at the top five cards of your library. You may reveal any number of Rat cards from among them and put the revealed cards into your hand. Put the rest on the bottom of your library in a random order.

Rat Colony

Creature — Rat

$4.55

This creature gets +1/+0 for each other Rat you control. A deck can have any number of cards named Rat Colony.

Lord Skitter, Sewer King

Legendary Creature — Rat Noble

$4.86

Whenever another Rat you control enters, exile up to one target card from an opponent's graveyard. At the beginning of combat on your turn, create a 1/1 black Rat creature token with "This token can't block."

Ratcatcher

Creature — Ogre Rogue

$9.28

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.) At the beginning of your upkeep, you may search your library for a Rat card, reveal it, put it into your hand, then shuffle.

Ashcoat of the Shadow Swarm

Legendary Creature — Rat Warlock

$3.26

Whenever Ashcoat attacks or blocks, other Rats you control get +X/+X until end of turn, where X is the number of Rats you control. At the beginning of your end step, you may mill four cards. If you do, return up to two Rat creature cards from your graveyard to your hand. (To mill a card, put the top card of your library into your graveyard.)

Swarm of Rats

Creature — Rat

$0.68

Swarm of Rats's power is equal to the number of Rats you control.

Valley Rotcaller

Creature — Squirrel Warlock

$1.97

Menace Whenever this creature attacks, each opponent loses X life and you gain X life, where X is the number of other Squirrels, Bats, Lizards, and Rats you control.

Pestilence Rats

Creature — Rat

$0.32

Pestilence Rats's power is equal to the number of other Rats on the battlefield. (For example, as long as there are two other Rats on the battlefield, Pestilence Rats's power and toughness are 2/3.)

Throat Slitter

Creature — Rat Ninja

$2.48

Ninjutsu {2}{B} ({2}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.) Whenever this creature deals combat damage to a player, destroy target nonblack creature that player controls.

Ayara, First of Locthwain

Legendary Creature — Elf Noble

$3.57

Whenever Ayara or another black creature you control enters, each opponent loses 1 life and you gain 1 life. {T}, Sacrifice another black creature: Draw a card.

Crypt Rats

Creature — Rat

$0.58

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

Rat King, Verminister

Legendary Creature — Rat Avatar

$0.69

Disappear — At the beginning of your end step, if a permanent left the battlefield under your control this turn, create a 1/1 black Rat creature token and put a +1/+1 counter on Rat King. {T}, Sacrifice three Rats: Return target creature card and all other cards with the same name as that card from your graveyard to the battlefield tapped.

Species Specialist

Creature — Human Warrior

$10.15

As this creature enters, choose a creature type. Whenever a creature of the chosen type dies, you may draw a card.

Ink-Eyes, Servant of Oni

Legendary Creature — Rat Ninja

$10.44

Ninjutsu {3}{B}{B} ({3}{B}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.) Whenever Ink-Eyes deals combat damage to a player, you may put target creature card from that player's graveyard onto the battlefield under your control. {1}{B}: Regenerate Ink-Eyes.

Persistent Marshstalker

Creature — Rat Berserker

$0.28

This creature gets +1/+0 for each other Rat you control. Threshold — Whenever you attack with one or more Rats, if there are seven or more cards in your graveyard, you may pay {2}{B}. If you do, return this card from your graveyard to the battlefield tapped and attacking.

Typhoid Rats

Creature — Rat

$0.21

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Mirkwood Bats

Creature — Bat

$0.85

Flying Whenever you create or sacrifice a token, each opponent loses 1 life.

Tangled Colony

Creature — Rat

$0.76

This creature can't block. When this creature dies, create X 1/1 black Rat creature tokens with "This token can't block," where X is the amount of damage dealt to it this turn.

Voracious Vermin

Creature — Rat

$0.32

When this creature enters, create a 1/1 black Rat creature token with "This token can't block." Whenever another creature you control dies, put a +1/+1 counter on this creature.

Lord Skitter's Butcher

Creature — Rat Peasant

$0.32

When this creature enters, choose one — • Create a 1/1 black Rat creature token with "This token can't block." • You may sacrifice another creature. If you do, scry 2, then draw a card. • Creatures you control gain menace until end of turn.

Burglar Rat

Creature — Rat

$0.2

When this creature enters, each opponent discards a card.

Gnat Miser

Creature — Rat Shaman

$0.94

Each opponent's maximum hand size is reduced by one.

Crypt Ghast

Creature — Spirit

$13.53

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}.

Rat King, Pale Piper

Legendary Creature — Rat Avatar

$0.37

Menace Whenever Rat King or another nontoken creature you control leaves the battlefield, create a 1/1 black Rat creature token. {2}, Sacrifice a token: Draw a card.

Chittering Witch

Creature — Human Warlock

$0.34

When this creature enters, create a number of 1/1 black Rat creature tokens equal to the number of opponents you have. {1}{B}, Sacrifice a creature: Target creature gets -2/-2 until end of turn.

Nashi, Moon Sage's Scion

Legendary Creature — Rat Ninja

$3.25

Ninjutsu {3}{B} ({3}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.) Whenever Nashi deals combat damage to a player, exile the top card of each player's library. Until end of turn, you may play one of those cards. If you cast a spell this way, pay life equal to its mana value rather than paying its mana cost.

Rancid Rats

Creature — Zombie Rat

$0.24

Skulk (This creature can't be blocked by creatures with greater power.) Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Relentless Rats

Creature — Rat

$3.98

This creature gets +1/+1 for each other creature on the battlefield named Relentless Rats. A deck can have any number of cards named Relentless Rats.

Gnawing Vermin

Creature — Rat

$0.28

When this creature enters, target player mills two cards. When this creature dies, target creature you don't control gets -1/-1 until end of turn.

Undercity Dire Rat

Creature — Rat

$0.15

Rat Tail — When this creature dies, create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Pitiless Plunderer

Creature — Human Pirate

$3.21

Whenever another creature you control dies, create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Dark Ritual

Instant

$0.44

Add {B}{B}{B}.

Foul-Tongue Shriek

Instant

$0.19

Target opponent loses 1 life for each attacking creature you control. You gain that much life.

Village Rites

Instant

$0.31

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

Defile

Instant

$1.32

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

Deadly Dispute

Instant

$0.26

As an additional cost to cast this spell, sacrifice an artifact or creature. Draw two cards and create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Go for the Throat

Instant

$0.28

Destroy target nonartifact creature.

Corrupted Conviction

Instant

$0.35

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

Infernal Grasp

Instant

$0.26

Destroy target creature. You lose 2 life.

Deadly Rollick

Instant

$27.34

If you control a commander, you may cast this spell without paying its mana cost. Exile target creature.

Tragic Slip

Instant

$0.18

Target creature gets -1/-1 until end of turn. Morbid — That creature gets -13/-13 until end of turn instead if a creature died this turn.

Culling the Weak

Instant

$6.84

As an additional cost to cast this spell, sacrifice a creature. Add {B}{B}{B}{B}.

Withering Torment

Instant

$0.71

Destroy target creature or enchantment. You lose 2 life.

Cabal Ritual

Instant

$14.55

Add {B}{B}{B}. Threshold — Add {B}{B}{B}{B}{B} instead if there are seven or more cards in your graveyard.

Altar's Reap

Instant

$0.16

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

Gruesome Fate

Sorcery

$0.22

Each opponent loses 1 life for each creature you control.

Kindred Dominance

Sorcery

$4.94

Choose a creature type. Destroy all creatures that aren't of the chosen type.

Swarmyard Massacre

Sorcery

$4.54

Create two 1/1 green Squirrel creature tokens. Then each creature that isn't an Insect, Rat, Spider, or Squirrel gets -1/-1 until end of turn for each creature you control that's an Insect, Rat, Spider, or Squirrel.

Bubbling Muck

Sorcery

$2.55

Until end of turn, whenever a player taps a Swamp for mana, that player adds an additional {B}.

Jet Medallion

Artifact

$13.11

Black spells you cast cost {1} less to cast.

Bontu's Monument

Legendary Artifact

$1.53

Black creature spells you cast cost {1} less to cast. Whenever you cast a creature spell, each opponent loses 1 life and you gain 1 life.

Skullclamp

Artifact — Equipment

$4.94

Equipped creature gets +1/-1. Whenever equipped creature dies, draw two cards. Equip {1}

Sword of the Squeak

Artifact — Equipment

$1.13

Equipped creature gets +1/+1 for each creature you control with base power or toughness 1. Whenever a Hamster, Mouse, Rat, or Squirrel you control enters, you may attach this Equipment to that creature. Equip {2}

Thornbite Staff

Kindred Artifact — Shaman Equipment

$11.33

Equipped creature has "{2}, {T}: This creature deals 1 damage to any target" and "Whenever a creature dies, untap this creature." Whenever a Shaman creature enters, you may attach this Equipment to it. Equip {4}

Ashnod's Altar

Artifact

$8.15

Sacrifice a creature: Add {C}{C}.

Sol Ring

Artifact

$1.02

{T}: Add {C}{C}.

Arcane Signet

Artifact

$0.38

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

Black Market

Enchantment

$5.04

Whenever a creature dies, put a charge counter on this enchantment. At the beginning of your first main phase, add {B} for each charge counter on this enchantment.

Black Market Connections

Enchantment

$10.47

At the beginning of your first main phase, choose one or more — • Sell Contraband — Create a Treasure token. You lose 1 life. • Buy Information — Draw a card. You lose 2 life. • Hire a Mercenary — Create a 3/2 colorless Shapeshifter creature token with changeling. You lose 3 life. (It is every creature type.)

Liliana of the Dark Realms

Legendary Planeswalker — Liliana

$9.3

+1: Search your library for a Swamp card, reveal it, put it into your hand, then shuffle. −3: Target creature gets +X/+X or -X/-X until end of turn, where X is the number of Swamps you control. −6: You get an emblem with "Swamps you control have '{T}: Add {B}{B}{B}{B}.'"

Swarmyard

Land

$5.22

{T}: Add {C}. {T}: Regenerate target Insect, Rat, Spider, or Squirrel. (The next time it would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Bojuka Bog

Land

$0.99

This land enters tapped. When this land enters, exile target player's graveyard. {T}: Add {B}.

Cabal Stronghold

Land

$12.82

{T}: Add {C}. {3}, {T}: Add {B} for each basic Swamp you control.

Mudflat Village

Land

$0.36

{T}: Add {C}. {T}: Add {B}. Spend this mana only to cast a creature spell. {1}{B}, {T}, Sacrifice this land: Return target Bat, Lizard, Rat, or Squirrel card from your graveyard to your hand.

Witch's Cottage

Land — Swamp

$0.4

({T}: Add {B}.) This land enters tapped unless you control three or more other Swamps. When this land enters untapped, you may put target creature card from your graveyard on top of your library.

Reliquary Tower

Land

$4.19

You have no maximum hand size. {T}: Add {C}.

Crypt of Agadeem

Land

$3.72

This land enters tapped. {T}: Add {B}. {2}, {T}: Add {B} for each black creature card in your graveyard.

Mortuary Mire

Land

$0.3

This land enters tapped. When this land enters, you may put target creature card from your graveyard on top of your library. {T}: Add {B}.

Rogue's Passage

Land

$0.29

{T}: Add {C}. {4}, {T}: Target creature can't be blocked this turn.

Castle Locthwain

Land

$1.38

This land enters tapped unless you control a Swamp. {T}: Add {B}. {1}{B}{B}, {T}: Draw a card, then you lose life equal to the number of cards in your hand.

War Room

Land

$0.74

{T}: Add {C}. {3}, {T}, Pay life equal to the number of colors in your commanders' color identity: Draw a card.

Takenuma, Abandoned Mire

Legendary Land

$10.68

{T}: Add {B}. Channel — {3}{B}, Discard this card: Mill three cards, then return a creature or planeswalker card from your graveyard to your hand. This ability costs {1} less to activate for each legendary creature you control.

Barren Moor

Land

$0.16

This land enters tapped. {T}: Add {B}. Cycling {B} ({B}, Discard this card: Draw a card.)

Temple of the False God

Land

$0.19

{T}: Add {C}{C}. Activate only if you control five or more lands.

Path of Ancestry

Land

$0.18

This land enters tapped. {T}: Add one mana of any color in your commander's color identity. When that mana is spent to cast a creature spell that shares a creature type with your commander, scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Myriad Landscape

Land

$0.25

This land enters tapped. {T}: Add {C}. {2}, {T}, Sacrifice this land: Search your library for up to two basic land cards that share a land type, put them onto the battlefield tapped, then shuffle.

Big Apple, 3 a.m.

Land

$0.34

This land enters tapped. As it enters, choose a color. {T}: Add one mana of the chosen color. {5}, {T}: Create a 1/1 black Rat creature token for each opponent you have.

Command Tower

Land

$0.24

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