| Mardu SiegebreakerTarkir: Dragonstorm · 364 | Tarkir: Dragonstorm | 364 | Rare | $0.69 |
| Mardu Strike LeaderCommander Legends: Battle for Baldur's Gate · 761 | Commander Legends: Battle for Baldur's Gate | 761 | Rare | €0.10 |
| Mardu Strike LeaderFate Reforged · 75 | Fate Reforged | 75 | Rare | €0.25 |
| Mardu Strike LeaderFate Reforged Promos · 75s | Fate Reforged Promos | 75s | Rare | €0.16 |
| Margle, Cousin of YargleUnknown Event · RZ05b | Unknown Event | RZ05b | Rare | — |
| Marina VendrellDuskmourn: House of Horror · 221 | Duskmourn: House of Horror | 221 | Rare | €0.13 |
| Marina VendrellDuskmourn: House of Horror · 360 | Duskmourn: House of Horror | 360 | Rare | €0.27 |
| Marina VendrellDuskmourn: House of Horror Promos · 221p | Duskmourn: House of Horror Promos | 221p | Rare | $0.22 |
| Marina VendrellDuskmourn: House of Horror Promos · 221s | Duskmourn: House of Horror Promos | 221s | Rare | €0.66 |
| Marina Vendrell's GrimoireDuskmourn: House of Horror · 64 | Duskmourn: House of Horror | 64 | Rare | €0.15 |
| Marina Vendrell's GrimoireDuskmourn: House of Horror · 308 | Duskmourn: House of Horror | 308 | Rare | €0.24 |
| Marina Vendrell's GrimoireDuskmourn: House of Horror Promos · 64p | Duskmourn: House of Horror Promos | 64p | Rare | €0.19 |
| Marina Vendrell's GrimoireDuskmourn: House of Horror Promos · 64s | Duskmourn: House of Horror Promos | 64s | Rare | €0.38 |
| Marionette MasterForgotten Realms Commander · 102 | Forgotten Realms Commander | 102 | Rare | €1.00 |
| Marionette MasterThe Brothers' War Commander · 109 | The Brothers' War Commander | 109 | Rare | €1.40 |
| Marionette MasterKaladesh · 90 | Kaladesh | 90 | Rare | $1.53 |
| Marionette MasterKaladesh Promos · 90s | Kaladesh Promos | 90s | Rare | €4.20 |
| Marionette MasterKaladesh Remastered · 98 | Kaladesh Remastered | 98 | Rare | — |
| Mariposa Military BaseFallout · 151 | Fallout | 151 | Rare | €0.28 |
| Mariposa Military BaseFallout · 443 | Fallout | 443 | Rare | €0.45 |
| Mariposa Military BaseFallout · 679 | Fallout | 679 | Rare | €1.12 |
| Mariposa Military BaseFallout · 971 | Fallout | 971 | Rare | €1.14 |
| Marisi's TwinclawsDCI Promos · 26 | DCI Promos | 26 | Rare | €0.29 |
| Mari, the Killing QuillNew Capenna Commander · 89 | New Capenna Commander | 89 | Rare | €3.75 |
| Mari, the Killing QuillNew Capenna Commander · 97 | New Capenna Commander | 97 | Rare | €3.97 |
| Mari, the Killing QuillOutlaws of Thunder Junction Commander · 138 | Outlaws of Thunder Junction Commander | 138 | Rare | €4.16 |
| Marit Lage's SlumberJumpstart 2022 · 319 | Jumpstart 2022 | 319 | Rare | €0.51 |
| Marit Lage's SlumberModern Horizons · 56 | Modern Horizons | 56 | Rare | €0.40 |
| Marit Lage's SlumberHistoric Anthology 4 · 6 | Historic Anthology 4 | 6 | Rare | — |
| MarjhanHomelands · 31 | Homelands | 31 | Rare | $0.55 |
| MarjhanMasters Edition II · 54 | Masters Edition II | 54 | Rare | — |
| Marketback WalkerAetherdrift · 235 | Aetherdrift | 235 | Rare | $0.36 |
| Marketback WalkerAetherdrift · 393 | Aetherdrift | 393 | Rare | $0.47 |
| Marketback WalkerAetherdrift · 498 | Aetherdrift | 498 | Rare | €2.84 |
| Marketback WalkerAetherdrift Promos · 235p | Aetherdrift Promos | 235p | Rare | €0.32 |
| Marketback WalkerAetherdrift Promos · 235s | Aetherdrift Promos | 235s | Rare | €1.36 |
| Mark of AsylumConflux · 10 | Conflux | 10 | Rare | €0.79 |
| Markov BlademasterDark Ascension · 96 | Dark Ascension | 96 | Rare | €0.28 |
| Markov BlademasterFoundations Jumpstart · 574 | Foundations Jumpstart | 574 | Rare | $0.31 |
| Markov DreadknightShadows over Innistrad Promos · 122 | Shadows over Innistrad Promos | 122 | Rare | €0.36 |
| Markov DreadknightShadows over Innistrad Promos · 122s | Shadows over Innistrad Promos | 122s | Rare | $0.40 |
| Markov DreadknightShadows over Innistrad · 122 | Shadows over Innistrad | 122 | Rare | €0.11 |
| Markov DreadknightMagic Online Promos · 60456 | Magic Online Promos | 60456 | Rare | — |
| Markov EnforcerFoundations Jumpstart · 575 | Foundations Jumpstart | 575 | Rare | $0.32 |
| Markov EnforcerCrimson Vow Commander · 26 | Crimson Vow Commander | 26 | Rare | €0.35 |
| Markov EnforcerCrimson Vow Commander · 64 | Crimson Vow Commander | 64 | Rare | €0.41 |
| Markov EnforcerMagic Online Promos · 95369 | Magic Online Promos | 95369 | Rare | — |
| MaroClassic Sixth Edition · 241 | Classic Sixth Edition | 241 | Rare | €0.42 |
| MaroSeventh Edition · 256 | Seventh Edition | 256 | Rare | €0.37 |
| MaroSeventh Edition · 256★ | Seventh Edition | 256★ | Rare | $0.39 |