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Magmaw
Magmaw 3RedRed (5)
Creature — Elemental (4/4)

1, Sacrifice a nonland permanent: Magmaw deals 1 damage to target creature or player.

Duel Decks: Zendikar vs. Eldrazi (Rare)
Other Versions
Rise of the Eldrazi (Rare)
Magnetic Mountain
Magnetic Mountain 1RedRed (3)
Enchantment

Blue creatures don't untap during their controllers' untap steps.

At the beginning of each player's upkeep, that player may choose any number of tapped blue creatures he or she controls and pay 4 for each creature chosen this way. If the player does, untap those creatures.

Fourth Edition (Rare)
Other Versions
Revised Edition (Rare)
Arabian Nights (Uncommon)
Magnetic Theft
Magnetic Theft Red (1)
Instant

Attach target Equipment to target creature. (Control of the Equipment doesn't change.)

Fifth Dawn (Uncommon)
Magnivore
Magnivore 2RedRed (4)
Creature — Lhurgoyf (*/*)

Haste (This creature can attack the turn it comes under your control.)

Magnivore's power and toughness are each equal to the number of sorcery cards in all graveyards.

Ninth Edition (Rare)
Other Versions
Odyssey (Rare)
Magus of the Abyss
Magus of the Abyss 3Black (4)
Creature — Human Wizard (4/3)

At the beginning of each player's upkeep, destroy target nonartifact creature that player controls of his or her choice. It can't be regenerated.

Commander 2017 (Rare)
Other Versions
Future Sight (Rare)
Magus of the Arena
Magus of the Arena 4RedRed (6)
Creature — Human Wizard (5/5)

3, Tap: Tap target creature you control and target creature of an opponent's choice he or she controls. Those creatures fight each other. (Each deals damage equal to its power to the other.)

Commander 2013 Edition (Rare)
Other Versions
Planar Chaos (Rare)
Magus of the Coffers
Magus of the Coffers 4Black (5)
Creature — Human Wizard (4/4)

2, Tap: Add Black to your mana pool for each Swamp you control.

Commander 2014 (Rare)
Other Versions
Planar Chaos (Rare)
Magus of the Mirror
Magus of the Mirror 4BlackBlack (6)
Creature — Human Wizard (4/2)

Tap, Sacrifice Magus of the Mirror: Exchange life totals with target opponent. Activate this ability only during your upkeep.

Magic: The Gathering—Conspiracy (Rare)
Other Versions
Time Spiral (Rare)
Magus of the Moon
Magus of the Moon 2Red (3)
Creature — Human Wizard (2/2)

Nonbasic lands are Mountains.

Future Sight (Rare)
Magus of the Scroll
Magus of the Scroll Red (1)
Creature — Human Wizard (1/1)

3, Tap: Choose a card name, then reveal a card at random from your hand. If that card has the chosen name, Magus of the Scroll deals 2 damage to target creature or player.

Time Spiral (Rare)
Magus of the Wheel
Magus of the Wheel 2Red (3)
Creature — Human Wizard (3/3)

1Red, Tap, Sacrifice Magus of the Wheel: Each player discards his or her hand, then draws seven cards.

Commander 2015 (Rare)
Magus of the Will
Magus of the Will 2Black (3)
Creature — Human Wizard (3/3)

2Black, Tap, Exile Magus of the Will: Until end of turn, you may play cards from your graveyard. If a card would be put into your graveyard from anywhere this turn, exile that card instead.

Commander 2016 (Rare)
Mairsil, the Pretender
Mairsil, the Pretender 1BlueBlackRed (4)
Legendary Creature — Human Wizard (4/4)

When Mairsil, the Pretender enters the battlefield, you may exile an artifact or creature card from your hand or graveyard and put a cage counter on it.

Mairsil, the Pretender has all activated abilities of all cards you own in exile with cage counters on them. You may activate each of those abilities only once each turn.

Commander 2017 (Mythic Rare)
Make Mischief
Make Mischief 2Red (3)
Sorcery

Make Mischief deals 1 damage to target creature or player. Create a 1/1 red Devil creature token. It has "When this creature dies, it deals 1 damage to target creature or player."

Eldritch Moon (Common)
Make Obsolete
Make Obsolete 2Black (3)
Instant

Creatures your opponents control get -1/-1 until end of turn.

Kaladesh (Uncommon)
Makeshift Mannequin
Makeshift Mannequin 3Black (4)
Instant

Return target creature card from your graveyard to the battlefield with a mannequin counter on it. For as long as that creature has a mannequin counter on it, it has "When this creature becomes the target of a spell or ability, sacrifice it."

Archenemy (Uncommon)
Other Versions
Lorwyn (Uncommon)
Makeshift Munitions
Makeshift Munitions 1Red (2)
Enchantment

1, Sacrifice an artifact or creature: Makeshift Munitions deals 1 damage to target creature or player.

Ixalan (Uncommon)
Makindi Sliderunner
Makindi Sliderunner 1Red (2)
Creature — Beast (2/1)

Trample

Landfall — Whenever a land enters the battlefield under your control, Makindi Sliderunner gets +1/+1 until end of turn.

Battle for Zendikar (Common)
Malakir Bloodwitch
Malakir Bloodwitch 3BlackBlack (5)
Creature — Vampire Shaman (4/4)

Flying, protection from white

When Malakir Bloodwitch enters the battlefield, each opponent loses life equal to the number of Vampires you control. You gain life equal to the life lost this way.

Commander 2017 (Rare)
Other Versions
Zendikar (Rare)
Malakir Cullblade
Malakir Cullblade 1Black (2)
Creature — Vampire Warrior (1/1)

Whenever a creature an opponent controls dies, put a +1/+1 counter on Malakir Cullblade.

Magic Origins (Uncommon)
Malakir Familiar
Malakir Familiar 2Black (3)
Creature — Bat (2/1)

Flying, deathtouch

Whenever you gain life, Malakir Familiar gets +1/+1 until end of turn.

Battle for Zendikar (Uncommon)
Malakir Soothsayer
Malakir Soothsayer 4Black (5)
Creature — Vampire Shaman Ally (4/4)

Cohort — Tap, Tap an untapped Ally you control: You draw a card and you lose 1 life.

Oath of the Gatewatch (Uncommon)
Malevolent Awakening
Malevolent Awakening 1BlackBlack (3)
Enchantment

1BlackBlack, Sacrifice a creature: Return target creature card from your graveyard to your hand.

Odyssey (Uncommon)
Malevolent Whispers
Malevolent Whispers 3Red (4)
Sorcery

Gain control of target creature until end of turn. Untap that creature. It gets +2/+0 and gains haste until end of turn.

Madness 3Red (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Shadows over Innistrad (Uncommon)
Malfegor
Malfegor 2BlackBlackRedRed (6)
Legendary Creature — Demon Dragon (6/6)

Flying

When Malfegor enters the battlefield, discard your hand. Each opponent sacrifices a creature for each card discarded this way.

Commander Anthology (Mythic Rare)
Other Versions
Conflux (Mythic Rare)
Magic: The Gathering-Commander (Mythic Rare)
Spite // Malice (Malice)
Spite // Malice (Malice) 3Black (4)
Instant

Destroy target nonblack creature. It can't be regenerated.

Duel Decks: Ajani vs. Nicol Bolas (Uncommon)
Other Versions
Invasion (Uncommon)
Malicious Advice
Malicious Advice Variable ColorlessBlueBlack (2)
Instant

Tap X target artifacts, creatures, and/or lands. You lose X life.

Planeshift (Common)
Malicious Affliction
Malicious Affliction BlackBlack (2)
Instant

Morbid — When you cast Malicious Affliction, if a creature died this turn, you may copy Malicious Affliction and may choose a new target for the copy.

Destroy target nonblack creature.

Eternal Masters (Rare)
Other Versions
Commander 2014 (Rare)
Malicious Intent
Malicious Intent 1Red (2)
Enchantment — Aura

Enchant creature

Enchanted creature has "Tap: Target creature can't block this turn."

Avacyn Restored (Common)
Malignus
Malignus 3RedRed (5)
Creature — Elemental Spirit (*/*)

Malignus's power and toughness are each equal to half the highest life total among your opponents, rounded up.

Damage that would be dealt by Malignus can't be prevented.

Avacyn Restored (Mythic Rare)
Mana Cache
Mana Cache 1RedRed (3)
Enchantment

At the beginning of each player's end step, put a charge counter on Mana Cache for each untapped land that player controls.

Remove a charge counter from Mana Cache: Add Colorless to your mana pool. Any player may activate this ability but only during his or her turn before the end step.

Nemesis (Rare)
Mana Clash
Mana Clash Red (1)
Sorcery

You and target opponent each flip a coin. Mana Clash deals 1 damage to each player whose coin comes up tails. Repeat this process until both players' coins come up heads on the same flip.

Ninth Edition (Rare)
Other Versions
Fourth Edition (Rare)
Fifth Edition (Rare)
Seventh Edition (Rare)
Eighth Edition (Rare)
The Dark (Rare)
Mana Echoes
Mana Echoes 2RedRed (4)
Enchantment

Whenever a creature enters the battlefield, you may add an amount of Colorless to your mana pool equal to the number of creatures you control that share a creature type with it.

Onslaught (Rare)
Mana Flair
Mana Flair 1Red (2)
Instant

Add Red to your mana pool for each nonland permanent by the artist of your choice.

Unhinged (Common)
Mana Flare
Mana Flare 2Red (3)
Enchantment

Whenever a player taps a land for mana, that player adds one mana to his or her mana pool of any type that land produced.

Masters Edition (Rare)
Other Versions
Limited Edition Alpha (Rare)
Limited Edition Beta (Rare)
Unlimited Edition (Rare)
Revised Edition (Rare)
Fourth Edition (Rare)
Fifth Edition (Rare)
Mana Geyser
Mana Geyser 3RedRed (5)
Sorcery

Add Red to your mana pool for each tapped land your opponents control.

Magic: The Gathering—Conspiracy (Common)
Other Versions
Fifth Dawn (Common)
Mana Leech
Mana Leech 2Black (3)
Creature — Leech (1/1)

You may choose not to untap Mana Leech during your untap step.

Tap: Tap target land. It doesn't untap during its controller's untap step for as long as Mana Leech remains tapped.

Urza's Saga (Uncommon)
Mana Seism
Mana Seism 1Red (2)
Sorcery

Sacrifice any number of lands, then add that much Colorless to your mana pool.

Champions of Kamigawa (Uncommon)
Mana Skimmer
Mana Skimmer 3Black (4)
Creature — Leech (2/2)

Flying

Whenever Mana Skimmer deals damage to a player, tap target land that player controls. That land doesn't untap during its controller's next untap step.

Time Spiral (Common)
Manabarbs
Manabarbs 3Red (4)
Enchantment

Whenever a player taps a land for mana, Manabarbs deals 1 damage to that player.

Magic 2012 (Rare)
Other Versions
Limited Edition Alpha (Rare)
Limited Edition Beta (Rare)
Unlimited Edition (Rare)
Revised Edition (Rare)
Fourth Edition (Rare)
Fifth Edition (Rare)
Classic Sixth Edition (Rare)
Tenth Edition (Rare)
Magic 2010 (Rare)
Mana-Charged Dragon
Mana-Charged Dragon 4RedRed (6)
Creature — Dragon (5/5)

Flying, trample

Join forces — Whenever Mana-Charged Dragon attacks or blocks, each player starting with you may pay any amount of mana. Mana-Charged Dragon gets +X/+0 until end of turn, where X is the total amount of mana paid this way.

Commander Anthology (Rare)
Other Versions
Magic: The Gathering-Commander (Rare)
Manaforge Cinder
Manaforge Cinder Black or Red (1)
Creature — Elemental Shaman (1/1)

1: Add Black or Red to your mana pool. Activate this ability no more than three times each turn.

Shadowmoor (Common)
Manamorphose
Manamorphose 1Red or Green (2)
Instant

Add two mana in any combination of colors to your mana pool.

Draw a card.

Modern Masters (Uncommon)
Other Versions
Shadowmoor (Common)
Maniacal Rage
Maniacal Rage 1Red (2)
Enchantment — Aura

Enchant creature

Enchanted creature gets +2/+2 and can't block.

Tempest Remastered (Common)
Other Versions
Exodus (Common)
Invasion (Common)
Battle Royale Box Set (Common)
Conflux (Common)
Manic Vandal
Manic Vandal 2Red (3)
Creature — Human Warrior (2/2)

When Manic Vandal enters the battlefield, destroy target artifact.

Magic 2012 (Common)
Other Versions
Magic 2011 (Common)
Mannichi, the Fevered Dream
Mannichi, the Fevered Dream 2Red (3)
Legendary Creature — Spirit (1/2)

1Red: Switch each creature's power and toughness until end of turn.

Betrayers of Kamigawa (Rare)
Manor Skeleton
Manor Skeleton 1Black (2)
Creature — Skeleton (1/1)

Haste

1Black: Regenerate Manor Skeleton.

Innistrad (Common)
Manticore Eternal
Manticore Eternal 3RedRed (5)
Creature — Zombie Manticore (5/4)

Afflict 3 (Whenever this creature becomes blocked, defending player loses 3 life.)

Manticore Eternal attacks each combat if able.

Hour of Devastation (Uncommon)
Manticore of the Gauntlet
Manticore of the Gauntlet 4Red (5)
Creature — Manticore (5/4)

When Manticore of the Gauntlet enters the battlefield, put a -1/-1 counter on target creature you control. Manticore of the Gauntlet deals 3 damage to target opponent.

Amonkhet (Common)
Mantis Rider
Mantis Rider BlueRedWhite (3)
Creature — Human Monk (3/3)

Flying, vigilance, haste

Khans of Tarkir (Rare)
Maralen of the Mornsong
Maralen of the Mornsong 1BlackBlack (3)
Legendary Creature — Elf Wizard (2/3)

Players can't draw cards.

At the beginning of each player's draw step, that player loses 3 life, searches his or her library for a card, puts it into his or her hand, then shuffles his or her library.

Morningtide (Rare)
Marang River Skeleton
Marang River Skeleton 1Black (2)
Creature — Skeleton (1/1)

Black: Regenerate Marang River Skeleton.

Megamorph 3Black (You may cast this card face down as a 2/2 creature for 3. Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)

Dragons of Tarkir (Uncommon)
Marath, Will of the Wild
Marath, Will of the Wild RedGreenWhite (3)
Legendary Creature — Elemental Beast (0/0)

Marath, Will of the Wild enters the battlefield with a number of +1/+1 counters on it equal to the amount of mana spent to cast it.

Variable Colorless, Remove X +1/+1 counters from Marath: Choose one —

• Put X +1/+1 counters on target creature. X can't be 0.

• Marath deals X damage to target creature or player. X can't be 0.

• Create an X/X green Elemental creature token. X can't be 0.

Commander 2013 Edition (Mythic Rare)
Marauding Boneslasher
Marauding Boneslasher 2Black (3)
Creature — Zombie Minotaur (3/3)

Marauding Boneslasher can't block unless you control another Zombie.

Hour of Devastation (Common)
Marauding Knight
Marauding Knight 2BlackBlack (4)
Creature — Zombie Knight (2/2)

Protection from white

Marauding Knight gets +1/+1 for each Plains your opponents control.

Invasion (Rare)
Marauding Looter
Marauding Looter 2BlueRed (4)
Creature — Human Pirate (4/3)

Raid — At the beginning of your end step, if you attacked with a creature this turn, you may draw a card. If you do, discard a card.

Ixalan (Uncommon)
Marauding Maulhorn
Marauding Maulhorn 2RedRed (4)
Creature — Beast (5/3)

Marauding Maulhorn attacks each combat if able unless you control a creature named Advocate of the Beast.

Magic 2014 Core Set (Common)
Maraxus of Keld
Maraxus of Keld 4RedRed (6)
Legendary Creature — Human Warrior (*/*)

Maraxus of Keld's power and toughness are each equal to the number of untapped artifacts, creatures, and lands you control.

Weatherlight (Rare)
March from the Tomb
March from the Tomb 3WhiteBlack (5)
Sorcery

Return any number of target Ally creature cards with total converted mana cost 8 or less from your graveyard to the battlefield.

Battle for Zendikar (Rare)
March of the Drowned
March of the Drowned Black (1)
Sorcery

Choose one —

• Return target creature card from your graveyard to your hand.

• Return two target Pirate cards from your graveyard to your hand.

Ixalan (Common)
March of the Returned
March of the Returned 3Black (4)
Sorcery

Return up to two target creature cards from your graveyard to your hand.

Theros (Common)
Marchesa, the Black Rose
Marchesa, the Black Rose 1BlueBlackRed (4)
Legendary Creature — Human Wizard (3/3)

Dethrone (Whenever this creature attacks the player with the most life or tied for most life, put a +1/+1 counter on it.)

Other creatures you control have dethrone.

Whenever a creature you control with a +1/+1 counter on it dies, return that card to the battlefield under your control at the beginning of the next end step.

Commander 2017 (Mythic Rare)
Other Versions
Magic: The Gathering—Conspiracy (Mythic Rare)
Vintage Masters (Mythic Rare)
Marchesa's Decree
Marchesa's Decree 3Black (4)
Enchantment

When Marchesa's Decree enters the battlefield, you become the monarch.

Whenever a creature attacks you or a planeswalker you control, that creature's controller loses 1 life.

Conspiracy: Take the Crown (Uncommon)
Marchesa's Smuggler
Marchesa's Smuggler BlueRed (2)
Creature — Human Rogue (1/1)

Dethrone (Whenever this creature attacks the player with the most life or tied for most life, put a +1/+1 counter on it.)

1BlueRed: Target creature you control gains haste until end of turn and can't be blocked this turn.

Magic: The Gathering—Conspiracy (Uncommon)
Mardu Ascendancy
Mardu Ascendancy RedWhiteBlack (3)
Enchantment

Whenever a nontoken creature you control attacks, create a 1/1 red Goblin creature token that's tapped and attacking.

Sacrifice Mardu Ascendancy: Creatures you control get +0/+3 until end of turn.

Khans of Tarkir (Rare)
Mardu Blazebringer
Mardu Blazebringer 2Red (3)
Creature — Ogre Warrior (4/4)

When Mardu Blazebringer attacks or blocks, sacrifice it at end of combat.

Khans of Tarkir (Uncommon)
Mardu Charm
Mardu Charm RedWhiteBlack (3)
Instant

Choose one —

• Mardu Charm deals 4 damage to target creature.

• Create two 1/1 white Warrior creature tokens. They gain first strike until end of turn.

• Target opponent reveals his or her hand. You choose a noncreature, nonland card from it. That player discards that card.

Khans of Tarkir (Uncommon)
Mardu Heart-Piercer
Mardu Heart-Piercer 3Red (4)
Creature — Human Archer (2/3)

Raid — When Mardu Heart-Piercer enters the battlefield, if you attacked with a creature this turn, Mardu Heart-Piercer deals 2 damage to target creature or player.

Khans of Tarkir (Uncommon)
Other Versions
Duel Decks: Speed vs. Cunning (Uncommon)
Mardu Roughrider
Mardu Roughrider 2RedWhiteBlack (5)
Creature — Orc Warrior (5/4)

Whenever Mardu Roughrider attacks, target creature can't block this turn.

Khans of Tarkir (Uncommon)
Mardu Runemark
Mardu Runemark 2Red (3)
Enchantment — Aura

Enchant creature

Enchanted creature gets +2/+2.

Enchanted creature has first strike as long as you control a white or black permanent.

Fate Reforged (Common)
Mardu Scout
Mardu Scout RedRed (2)
Creature — Goblin Scout (3/1)

Dash 1Red (You may cast this spell for its dash cost. If you do, it gains haste, and it's returned from the battlefield to its owner's hand at the beginning of the next end step.)

Fate Reforged (Common)
Mardu Shadowspear
Mardu Shadowspear Black (1)
Creature — Human Warrior (1/1)

Whenever Mardu Shadowspear attacks, each opponent loses 1 life.

Dash 1Black (You may cast this spell for its dash cost. If you do, it gains haste, and it's returned from the battlefield to its owner's hand at the beginning of the next end step.)

Fate Reforged (Uncommon)
Mardu Skullhunter
Mardu Skullhunter 1Black (2)
Creature — Human Warrior (2/1)

Mardu Skullhunter enters the battlefield tapped.

Raid — When Mardu Skullhunter enters the battlefield, if you attacked with a creature this turn, target opponent discards a card.

Khans of Tarkir (Common)
Mardu Strike Leader
Mardu Strike Leader 2Black (3)
Creature — Human Warrior (3/2)

Whenever Mardu Strike Leader attacks, create a 2/1 black Warrior creature token.

Dash 3Black (You may cast this spell for its dash cost. If you do, it gains haste, and it's returned from the battlefield to its owner's hand at the beginning of the next end step.)

Fate Reforged (Rare)
Mardu Warshrieker
Mardu Warshrieker 3Red (4)
Creature — Orc Shaman (3/3)

Raid — When Mardu Warshrieker enters the battlefield, if you attacked with a creature this turn, add RedWhiteBlack to your mana pool.

Khans of Tarkir (Common)
Marhault Elsdragon
Marhault Elsdragon 3RedRedGreen (6)
Legendary Creature — Elf Warrior (4/6)

Rampage 1 (Whenever this creature becomes blocked, it gets +1/+1 until end of turn for each creature blocking it beyond the first.)

Masters Edition III (Uncommon)
Other Versions
Legends (Uncommon)
Chronicles (Uncommon)
Marionette Master
Marionette Master 4BlackBlack (6)
Creature — Human Artificer (1/3)

Fabricate 3 (When this creature enters the battlefield, put three +1/+1 counters on it or create three 1/1 colorless Servo artifact creature tokens.)

Whenever an artifact you control is put into a graveyard from the battlefield, target opponent loses life equal to Marionette Master's power.

Kaladesh (Rare)
Marisi's Twinclaws
Marisi's Twinclaws 2Red or WhiteGreen (4)
Creature — Cat Warrior (2/4)

Double strike

Duel Decks: Ajani vs. Nicol Bolas (Uncommon)
Other Versions
Alara Reborn (Uncommon)
Mark for Death
Mark for Death 3Red (4)
Sorcery

Target creature an opponent controls blocks this turn if able. Untap that creature. Other creatures that player controls can't block this turn.

Gatecrash (Uncommon)
Mark of Fury
Mark of Fury Red (1)
Enchantment — Aura

Enchant creature

Enchanted creature has haste.

At the beginning of the end step, return Mark of Fury to its owner's hand.

Urza's Destiny (Common)
Mark of Mutiny
Mark of Mutiny 2Red (3)
Sorcery

Gain control of target creature until end of turn. Put a +1/+1 counter on it and untap it. That creature gains haste until end of turn. (It can attack and Tap this turn.)

Planechase Anthology (Uncommon)
Other Versions
Zendikar (Uncommon)
Planechase 2012 Edition (Uncommon)
Magic 2013 (Uncommon)
Mark of the Oni
Mark of the Oni 2Black (3)
Enchantment — Aura

Enchant creature

You control enchanted creature.

At the beginning of the end step, if you control no Demons, sacrifice Mark of the Oni.

Betrayers of Kamigawa (Uncommon)
Mark of the Vampire
Mark of the Vampire 3Black (4)
Enchantment — Aura

Enchant creature

Enchanted creature gets +2/+2 and has lifelink.

Ixalan (Common)
Other Versions
Magic 2013 (Common)
Duel Decks: Sorin vs. Tibalt (Common)
Magic 2014 Core Set (Common)
Markov Blademaster
Markov Blademaster 1RedRed (3)
Creature — Vampire Warrior (1/1)

Double strike

Whenever Markov Blademaster deals combat damage to a player, put a +1/+1 counter on it.

Dark Ascension (Rare)
Markov Crusader
Markov Crusader 4Black (5)
Creature — Vampire Knight (4/3)

Lifelink

Markov Crusader has haste as long as you control another Vampire.

Eldritch Moon (Uncommon)
Markov Dreadknight
Markov Dreadknight 3BlackBlack (5)
Creature — Vampire Knight (3/3)

Flying

2Black, Discard a card: Put two +1/+1 counters on Markov Dreadknight.

Shadows over Innistrad (Rare)
Markov Patrician
Markov Patrician 2Black (3)
Creature — Vampire (3/1)

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Innistrad (Common)
Markov Warlord
Markov Warlord 5Red (6)
Creature — Vampire Warrior (4/4)

Haste

When Markov Warlord enters the battlefield, up to two target creatures can't block this turn.

Dark Ascension (Uncommon)
Markov's Servant
Markov's Servant (0)
Creature — Vampire (4/4)

Dark Ascension (Common)
Marrow Bats
Marrow Bats 4Black (5)
Creature — Bat Skeleton (4/1)

Flying

Pay 4 life: Regenerate Marrow Bats.

Commander 2013 Edition (Uncommon)
Other Versions
Avacyn Restored (Uncommon)
Marrow Chomper
Marrow Chomper 3BlackGreen (5)
Creature — Zombie Lizard (3/3)

Devour 2 (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters the battlefield with twice that many +1/+1 counters on it.)

When Marrow Chomper enters the battlefield, you gain 2 life for each creature it devoured.

Alara Reborn (Uncommon)
Marrow-Gnawer
Marrow-Gnawer 3BlackBlack (5)
Legendary Creature — Rat Rogue (2/3)

Rat creatures have fear. (They can't be blocked except by artifact creatures and/or black creatures.)

Tap, Sacrifice a Rat: Create X 1/1 black Rat creature tokens, where X is the number of Rats you control.

Champions of Kamigawa (Rare)
Marsh Casualties
Marsh Casualties BlackBlack (2)
Sorcery

Kicker 3 (You may pay an additional 3 as you cast this spell.)

Creatures target player controls get -1/-1 until end of turn. If Marsh Casualties was kicked, those creatures get -2/-2 until end of turn instead.

Duel Decks: Zendikar vs. Eldrazi (Uncommon)
Other Versions
Zendikar (Uncommon)
Duel Decks: Jace vs. Vraska (Uncommon)
Marsh Crocodile
Marsh Crocodile 2BlueBlack (4)
Creature — Crocodile (4/4)

When Marsh Crocodile enters the battlefield, return a blue or black creature you control to its owner's hand.

When Marsh Crocodile enters the battlefield, each player discards a card.

Planeshift (Uncommon)
Marsh Flitter
Marsh Flitter 3Black (4)
Creature — Faerie Rogue (1/1)

Flying

When Marsh Flitter enters the battlefield, create two 1/1 black Goblin Rogue creature tokens.

Sacrifice a Goblin: Marsh Flitter has base power and toughness 3/3 until end of turn.

Modern Masters (Uncommon)
Other Versions
Lorwyn (Uncommon)
Marsh Gas
Marsh Gas Black (1)
Instant

All creatures get -2/-0 until end of turn.

Fourth Edition (Common)
Other Versions
The Dark (Common)
Marsh Goblins
Marsh Goblins BlackRed (2)
Creature — Goblin (1/1)

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

The Dark (Common)
Marsh Hulk
Marsh Hulk 4BlackBlack (6)
Creature — Zombie Ogre (4/6)

Megamorph 6Black (You may cast this card face down as a 2/2 creature for 3. Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)

Dragons of Tarkir (Common)
Marsh Lurker
Marsh Lurker 3Black (4)
Creature — Beast (3/2)

Sacrifice a Swamp: Marsh Lurker gains fear until end of turn. (It can't be blocked except by artifact creatures and/or black creatures.)

Tempest (Common)
Marshmist Titan
Marshmist Titan 6Black (7)
Creature — Giant (4/5)

Marshmist Titan costs Variable Colorless less to cast, where X is your devotion to black. (Each Black in the mana costs of permanents you control counts toward your devotion to black.)

Born of the Gods (Common)