| 17 | Mortal Obstinacy | Slawomir Maniak | White | C | Journey into Nyx |
| 207 | Mortality Spear | PINDURSKI | Black/Green | U | Strixhaven: School of Mages |
| 380 | Mortality Spear | PINDURSKI | Black/Green | U | Strixhaven: School of Mages |
| 19 | Mortal's Ardor | Kev Walker | White | C | Duel Decks: Elspeth vs. Kiora |
| 20 | Mortal's Ardor | Kev Walker | White | C | Born of the Gods |
| 127 | Mortal's Resolve | Svetlin Velinov | Green | C | Born of the Gods |
| 66 | Mortis Dogs | Chippy | Black | C | New Phyrexia |
| 179 | Mortus Strider | Tomasz Jedruszek | Blue/Black | C | Gatecrash |
| 203 | Mortus Strider | Tiffany Turrill | Blue/Black | C | Ravnica Remastered |
| 6 | Mosquito Guard | Randy Gallegos | White | C | Duel Decks: Elspeth vs. Tezzeret |
| 18 | Mosquito Guard | Randy Gallegos | White | C | Morningtide |
| Moss Diamond | Donato Giancola | | U | Mirage |
| 222 | Moss Diamond | Lindsey Look | | U | Commander Anthology |
| 252 | Moss Diamond | Lindsey Look | | U | Commander 2014 |
| 300 | Moss Diamond | Donato Giancola | | U | Classic Sixth Edition |
| 309 | Moss Diamond | David Martin | | U | Seventh Edition |
| 327 | Moss Diamond | Gaboleps | | C | Commander Legends: Battle for Baldur's Gate |
| 327 | Moss Diamond | Lindsey Look | | C | Commander Legends |
| 448 | Moss Diamond | Phil Stone | | C | Commander Legends: Battle for Baldur's Gate |
| 228 | Moss Kami | Hugh Jamieson | Green | C | Champions of Kamigawa |
| Moss Monster | Jesper Myrfors | Green | C | Legends |
| 267 | Moss Monster | Glen Angus | Green | C | Eighth Edition |
| 179 | Moss Viper | Mike Bierek | Green | C | Theros Beyond Death |
| 173 | Mossbeard Ancient | Alexandre Honoré | Green | U | Dominaria United |
| 107 | Mossborn Hydra | Monztre | Green | R | Magic: The Gathering Foundations |
| 337 | Mossborn Hydra | Monztre | Green | R | Magic: The Gathering Foundations |
| 399 | Mossborn Hydra | Monztre | Green | R | Magic: The Gathering Foundations |
| 471 | Mossborn Hydra | Monztre | Green | R | Magic: The Gathering Foundations |
| 123 | Mossbridge Troll | Jeremy Jarvis | Green | R | Shadowmoor |
| 167 | Mosscoat Goriak | Dan Scott | Green | C | Ikoria: Lair of Behemoths |
| 106 | Mossdog | Matt Cavotta | Green | C | Nemesis |
| 304 | Mossfire Egg | David Martin | | U | Odyssey |
| 171 | Mossfire Valley | Sarah Finnigan | | R | Kamigawa: Neon Dynasty Commander |
| 250 | Mossfire Valley | Yeong-Hao Han | | R | Adventures in the Forgotten Realms Commander |
| 273 | Mossfire Valley | Nino Is | | R | Magic The Gathering—Fallout |
| 274 | Mossfire Valley | John Avon | | R | Murders at Karlov Manor Commander |
| 290 | Mossfire Valley | John Avon | | R | Ikoria Commander |
| 316 | Mossfire Valley | John Avon | | R | Bloomburrow Commander |
| 321 | Mossfire Valley | John Avon | | R | Odyssey |
| 357 | Mossfire Valley | John Avon | | R | Modern Horizons 3 Commander |
| 414 | Mossfire Valley | Sarah Finnigan | | R | March of the Machine Commander |
| 414 | Mossfire Valley | Yeong-Hao Han | | R | Streets of New Capenna Commander |
| 501 | Mossfire Valley | Nino Is | | R | Magic The Gathering—Fallout |
| 901 | Mossfire Valley | Yeong-Hao Han | | R | Commander Legends: Battle for Baldur's Gate |
| 228 | Moss-Pit Skeleton | Bryan Sola | Black/Green | U | Zendikar Rising |
| 139 | Mosstodon | Parente | Green | C | Shards of Alara |
| 231 | Mosswood Dreadknight | Ryan Pancoast | Green | R | Wilds of Eldraine |
| 292 | Mosswood Dreadknight | Keith Garletts | Green | R | Wilds of Eldraine |
| 29 | Mosswort Bridge | Jeremy Jarvis | | R | Duel Decks: Nissa vs. Ob Nixilis |
| 130 | Mosswort Bridge | Jeremy Jarvis | | R | Archenemy |
| 251 | Mosswort Bridge | Jeremy Jarvis | | R | Adventures in the Forgotten Realms Commander |
| 261 | Mosswort Bridge | Jeremy Jarvis | | R | Commander 2017 |
| 267 | Mosswort Bridge | Jeremy Jarvis | | R | Commander 2018 |
| 270 | Mosswort Bridge | Jeremy Jarvis | | R | Lorwyn |
| 275 | Mosswort Bridge | Jeremy Jarvis | | R | Murders at Karlov Manor Commander |
| 288 | Mosswort Bridge | Jeremy Jarvis | | R | Duskmourn: House of Horror Commander |
| 291 | Mosswort Bridge | Jeremy Jarvis | | R | Ikoria Commander |
| 294 | Mosswort Bridge | Jeremy Jarvis | | R | Commander 2015 |
| 303 | Mosswort Bridge | Jeremy Jarvis | | R | Commander 2021 |
| 307 | Mosswort Bridge | Jeremy Jarvis | | R | Commander 2016 |
| 307 | Mosswort Bridge | Jeremy Jarvis | | R | Commander 2013 Edition |
| 317 | Mosswort Bridge | Jeremy Jarvis | | R | Bloomburrow Commander |
| 342 | Mosswort Bridge | Jeremy Jarvis | | R | The Lost Caverns of Ixalan Commander |
| 415 | Mosswort Bridge | Jeremy Jarvis | | R | March of the Machine Commander |
| 415 | Mosswort Bridge | Jeremy Jarvis | | R | Streets of New Capenna Commander |
| 902 | Mosswort Bridge | Jeremy Jarvis | | R | Commander Legends: Battle for Baldur's Gate |
| 144 | Most Valuable Slayer | Patrik Hell | Red | C | Duskmourn: House of Horror |
| 153 | Most Wanted | Rémi Jacquot | Green | C | Streets of New Capenna |
| 42 | Mothdust Changeling | Shelly Wan | Blue | C | Morningtide |
| 53 | Mothdust Changeling | Shelly Wan | Blue | C | Modern Masters |
| 59 | Mother of Goons | Darrell Riche | Black | C | Unhinged |
| 14 | Mother of Runes | Scott M. Fischer | White | U | Urza's Legacy |
| 17 | Mother of Runes | Scott M. Fischer | White | U | Commander Anthology |
| 20 | Mother of Runes | Terese Nielsen | White | U | Duel Decks: Elspeth vs. Kiora |
| 21 | Mother of Runes | Scott M. Fischer | White | U | Magic: The Gathering-Commander |
| 22 | Mother of Runes | Terese Nielsen | White | R | Eternal Masters |
| 702 | Mother of Runes | Scott M. Fischer | White | U | Commander Legends: Battle for Baldur's Gate |
| 598 | Mothers Yamazaki (playtest) | Marika Lord | White/Red | R | Mystery Booster 2: Convention Edition |
| 34 | Mothrider Samurai | Mark Zug | White | C | Champions of Kamigawa |
| 53 | Motion Sickness | Raluca Marinescu | Blue | C | Unfinity |
| 136 | Mount Velus Manticore | Olena Richards | Red | C | Modern Horizons 2 |
| Mountain Stronghold | Tom Wänerstrand | | U | Legends |
| Mounted Archers | Kev Walker | White | C | Tempest |
| 19 | Mounted Archers | Kev Walker | White | C | Tempest Remastered |
| 209 | Mourner's Shield | Carl Critchlow | | U | Mirrodin |
| 94 | Mourner's Surprise | Zuzanna Wuzyk | Black | C | Outlaws of Thunder Junction |
| 22 | Mouse Trapper | Jakub Kasper | White | U | Bloomburrow |
| 124 | Mox Lotus | Kevin Dobler | | R | Unhinged |
| 608 | Mox Poison (playtest) | Dan Frazier | | R | Mystery Booster 2: Convention Edition |
| Mox Sapphire | Dan Frazier | | R | Unlimited Edition |
| Mox Sapphire | Dan Frazier | | R | Limited Edition Beta |
| Mox Sapphire | Dan Frazier | | R | Limited Edition Alpha |
| 9 | Mox Sapphire | Volkan Baga | | B | Vintage Masters |
| 7 | Mr. House, President and CEO | Joseph Meehan | White/Black/Red | M | Magic The Gathering—Fallout |
| 421 | Mr. House, President and CEO | Joseph Meehan | White/Black/Red | M | Magic The Gathering—Fallout |
| 3 | Ms. Bumbleflower | Marta Nael | White/Blue/Green | M | Bloomburrow Commander |
| 103 | Ms. Bumbleflower | KIYA | White/Blue/Green | M | Bloomburrow Commander |
| 286 | Mu Yanling, Celestial Wind | Yongjae Choi | Blue | M | Core Set 2020 |
| 68 | Mu Yanling, Sky Dancer | G-host Lee | Blue | M | Core Set 2020 |
| Muck Rats | Una Fricker | Black | C | Portal Second Age |
| Muck Rats | Colin MacNeil | Black | C | Portal |
| 84 | Muck Rats | Una Fricker | Black | C | Starter 1999 |
| 213 | Mudbrawler Raiders | Ron Spencer | Red/Green | C | Shadowmoor |
| Mudslide | Brian Snoddy | Red | R | Ice Age |
| 136 | Mudslide | Brian Snoddy | Red | R | Masters Edition II |
| 227 | Muerra, Trash Tactician | Volkan Baga | Red/Green | R | Bloomburrow |
| 352 | Muerra, Trash Tactician | 山崎太郎/Taro Yamazaki | Red/Green | R | Bloomburrow |
| 112 | Mukotai Ambusher | Raymond Swanland | Black | C | Kamigawa: Neon Dynasty |
| 342 | Mukotai Ambusher | 西木あれく/Areku Nishiki | Black | C | Kamigawa: Neon Dynasty |
| 113 | Mukotai Soulripper | Eddie Mendoza | Black | R | Kamigawa: Neon Dynasty |
| 381 | Mukotai Soulripper | T-TRACK | Black | R | Kamigawa: Neon Dynasty |
| 458 | Mukotai Soulripper | Eddie Mendoza | Black | R | Kamigawa: Neon Dynasty |
| 198 | Mul Daya Channelers | Jason Chan | Green | R | Rise of the Eldrazi |
| 107 | Multani, Maro-Sorcerer | Daren Bader | Green | R | Urza's Legacy |
| 75 | Multani, Yavimaya's Avatar | Ryan Yee | Green | M | Zendikar Rising Commander |
| 174 | Multani, Yavimaya's Avatar | Ryan Yee | Green | M | Dominaria |
| 190 | Multani, Yavimaya's Avatar | Ryan Yee | Green | M | Duskmourn: House of Horror Commander |
| 248 | Multani, Yavimaya's Avatar | Brom | Green | M | Mystery Booster 2: Convention Edition |
| 108 | Multani's Acolyte | Edward P. Beard, Jr. | Green | C | Urza's Legacy |
| 114 | Multani's Decree | Eric Peterson | Green | C | Urza's Destiny |
| 84 | Multani's Harmony | Darrell Riche | Green | U | Planeshift |
| 109 | Multani's Presence | Scott M. Fischer | Green | U | Urza's Legacy |
| 644 | Multiclass Baldric | Franz Vohwinkel | | R | Commander Legends: Battle for Baldur's Gate |
| 684 | Multiclass Baldric | Franz Vohwinkel | | R | Commander Legends: Battle for Baldur's Gate |
| 215 | Munda, Ambush Leader | Johannes Voss | White/Red | R | Battle for Zendikar |
| 29 | Munda's Vanguard | Steve Prescott | White | R | Oath of the Gatewatch |
| 209 | Munitions Expert | Jesper Ejsing | Black/Red | U | Modern Horizons |
| 519 | Muraganda Eldrazi (playtest) | Jair Medina | White | R | Mystery Booster 2: Convention Edition |
| 146 | Muraganda Petroglyphs | Scott Altmann | Green | R | Future Sight |
| 220 | Muraganda Petroglyphs | Scott Altmann | Green | R | Time Spiral Remastered |
| 172 | Murasa Behemoth | Dave Kendall | Green | C | Modern Horizons |
| 195 | Murasa Brute | Caio Monteiro | Green | C | Zendikar Rising |
| 139 | Murasa Pyromancer | Kekai Kotaki | Red | U | Zendikar |
| 178 | Murasa Ranger | Eric Deschamps | Green | U | Battle for Zendikar |
| 229 | Murasa Rootgrazer | Mathias Kollros | White/Green | U | Zendikar Rising |
| 196 | Murasa Sproutling | Svetlin Velinov | Green | U | Zendikar Rising |
| 21 | Murder Investigation | Igor Kieryluk | White | U | Gatecrash |
| 27 | Murder Investigation | Igor Kieryluk | White | U | Magic Origins |
| 219 | Murder Investigation | Igor Kieryluk | White | U | Jumpstart 2022 |
| 19 | Murder of Crows | Drew Baker | Blue | U | Shadows of the Past |
| 66 | Murder of Crows | Drew Baker | Blue | U | Masters 25 |
| 70 | Murder of Crows | Drew Baker | Blue | U | Innistrad |
| 88 | Murder of Crows | Drew Baker | Blue | U | Adventures in the Forgotten Realms Commander |
| 106 | Murder of Crows | Drew Baker | Blue | U | Commander Masters |
| 255 | Murderer's Axe | Winona Nelson | | U | Shadows Over Innistrad Remastered |
| 259 | Murderer's Axe | Winona Nelson | | U | Shadows over Innistrad |
| 61 | Murderous Betrayal | Randy Gallegos | Black | R | Nemesis |
| 147 | Murderous Betrayal | Randy Gallegos | Black | R | Eighth Edition |
| 122 | Murderous Compulsion | David Palumbo | Black | C | Commander 2019 |
| 126 | Murderous Compulsion | David Palumbo | Black | C | Shadows over Innistrad |
| 81 | Murderous Cut | Yohann Schepacz | Black | U | Khans of Tarkir |
| 192 | Murderous Redcap | Dave Allsop | Black/Red | U | Modern Masters |
| 192 | Murderous Redcap | Dave Allsop | Black/Red | U | Shadowmoor |
| 217 | Murderous Redcap | Dave Allsop | Black/Red | U | Ultimate Masters |
| 97 | Murderous Rider | Josh Hass | Black | R | Throne of Eldraine |
| 258 | Murderous Rider | Josh Hass | Black | R | March of the Machine Commander |
| 48 | Murderous Spoils | Adam Rex | Black | U | Darksteel |
| Murk Dwellers | Drew Tucker | Black | C | Fifth Edition |
| Murk Dwellers | Drew Tucker | Black | C | Fourth Edition |
| Murk Dwellers | Drew Tucker | Black | C | The Dark |
| 62 | Murk Strider | Chase Stone | Blue | C | Battle for Zendikar |
| 263 | Murky Sewer | Martin de Diego Sádaba | | L | Duskmourn: House of Horror |
| 11 | Murmuring Bosk | John Avon | | M | From the Vault: Realms |
| 147 | Murmuring Bosk | John Avon | | R | Morningtide |
| 220 | Murmuring Bosk | John Avon | | R | Dominaria United Commander |
| 258 | Murmuring Bosk | John Avon | | R | Commander Anthology 2018 |
| 308 | Murmuring Bosk | John Avon | | R | Commander 2016 |
| 320 | Murmuring Bosk | Antonio José Manzanedo | | R | The Lord of the Rings: Tales of Middle Earth Commander |
| 32 | Murmuring Mystic | Mark Winters | Blue | U | Game Night: Free-For-All |
| 45 | Murmuring Mystic | Mark Winters | Blue | U | Guilds of Ravnica |
| 51 | Murmuring Mystic | Mark Winters | Blue | U | Ravnica Remastered |
| 102 | Murmuring Mystic | Mark Winters | Blue | C | Outlaws of Thunder Junction Commander |
| 107 | Murmuring Mystic | Mark Winters | Blue | C | Commander Masters |
| 118 | Murmuring Mystic | Mark Winters | Blue | U | Ikoria Commander |
| 15 | Murmuring Phantasm | Peter Mohrbacher | Blue | C | Dragon's Maze |
| 157 | Murmuring Phantasm | Peter Mohrbacher | Blue | C | Jumpstart |
| 47 | Murmurs from Beyond | Paolo Parente | Blue | C | Saviors of Kamigawa |
| 53 | Murmurs from Beyond | Parente | Blue | C | Magic: The Gathering-Commander |
| 252 | Muscle Burst | Gary Ruddell | Green | C | Odyssey |
| Muscle Sliver | Richard Kane Ferguson | Green | C | Tempest |
| 9 | Muscle Sliver | Richard Kane Ferguson | Green | C | Premium Deck Series: Slivers |
| 182 | Muscle Sliver | Richard Kane Ferguson | Green | C | Tempest Remastered |
| 46 | Muse Drake | Titus Lunter | Blue | C | Guilds of Ravnica |
| 163 | Muse Vessel | Christopher Rush | | R | Dissension |
| 28 | Muse Vortex | Kieran Yanner | Blue | R | Commander 2021 |
| 355 | Muse Vortex | Kieran Yanner | Blue | R | Commander 2021 |
| 25 | Museum Nightwatch | Alix Branwyn | White | C | Murders at Karlov Manor |
| 180 | Mushroom Watchdogs | Alexander Ostrowski | Green | C | The Lord of the Rings: Tales of Middle Earth |
| 631 | Mushroom Watchdogs | Alexander Ostrowski | Green | C | The Lord of the Rings: Tales of Middle Earth |
| Musician | Drew Tucker | Blue | R | Ice Age |
| 56 | Musician | Drew Tucker | Blue | R | Masters Edition II |
| 36 | Muster the Departed | Andrew Mar | White | U | Modern Horizons 3 |
| 248 | Mutagen Connoisseur | Alex Brock | Blue/Green | U | March of the Machine |
| 134 | Mutalith Vortex Beast | Kekai Kotaki | Blue/Red | R | Warhammer 40,000 Commander |
| 45 | Mutant's Prey | Ryan Barger | Green | C | Dragon's Maze |
| 53 | Mutated Cultist | Dave Kendall | Black | R | Modern Horizons 3 Commander |
| 105 | Mutated Cultist | Dave Kendall | Black | R | Modern Horizons 3 Commander |
| 96 | Mutual Destruction | PINDURSKI | Black | C | Ikoria: Lair of Behemoths |
| 24 | Muxus, Goblin Grandee | Dmitry Burmak | Red | R | Jumpstart |
| 575 | Muxus, Goblin Grandee | Dmitry Burmak | Red | R | Jumpstart 2022 |
| 23 | Muzzio, Visionary Architect | Volkan Baga | Blue | M | Magic: The Gathering—Conspiracy |
| 82 | Muzzio, Visionary Architect | Volkan Baga | Blue | M | Vintage Masters |
| 89 | Muzzio, Visionary Architect | Volkan Baga | Blue | M | The Brothers' War Commander |