| Mathas, Fiend SeekerTreasure Chest · 65759 | Treasure Chest | 65759 | Mythic Rare | — |
| MathemagicsSecrets of Strixhaven Promos · 58p | Secrets of Strixhaven Promos | 58p | Mythic Rare | €1.58 |
| MathemagicsSecrets of Strixhaven · 58 | Secrets of Strixhaven | 58 | Mythic Rare | $2.26 |
| MathemagicsSecrets of Strixhaven · 320 | Secrets of Strixhaven | 320 | Mythic Rare | €4.08 |
| Mathemagics // MathemagicsSecrets of Strixhaven Art Series · 8 | Secrets of Strixhaven Art Series | 8 | — | — |
| Mathise, Surge ChannelerUniverses Within · 25 | Universes Within | 25 | Rare | €4.31 |
| Mathise, Surge ChannelerSecret Lair Drop Tokens · 1238 | Secret Lair Drop Tokens | 1238 | Rare | €6.63 |
| Math is for BlockersUnknown Event · RR16 | Unknown Event | RR16 | Rare | — |
| Math is for Blockers (Plane)Secret Lair Showcase Planes · 7 | Secret Lair Showcase Planes | 7 | Common | €19.98 |
| Matoc, LavamancerMystery Booster Commander Edition · 25 | Mystery Booster Commander Edition | 25 | Rare | €1.00 |
| Matopi GolemVisions · 150 | Visions | 150 | Uncommon | €0.16 |
| Matoya, Archon ElderFinal Fantasy · 62 | Final Fantasy | 62 | Rare | €0.70 |
| Matoya, Archon ElderFinal Fantasy · 439 | Final Fantasy | 439 | Rare | €2.37 |
| Matoya, Archon ElderFinal Fantasy Promos · 62s | Final Fantasy Promos | 62s | Rare | €3.13 |
| Matsu-Tribe BirdstalkerSaviors of Kamigawa · 137 | Saviors of Kamigawa | 137 | Common | €0.09 |
| Matsu-Tribe DecoyChampions of Kamigawa · 227 | Champions of Kamigawa | 227 | Common | €0.11 |
| Matsu-Tribe SniperBetrayers of Kamigawa · 136 | Betrayers of Kamigawa | 136 | Common | €0.08 |
| Matterbending MageSecrets of Strixhaven · 59 | Secrets of Strixhaven | 59 | Uncommon | €0.04 |
| Matter ReshaperCommander Masters · 806 | Commander Masters | 806 | Rare | €0.49 |
| Matter ReshaperOath of the Gatewatch · 6 | Oath of the Gatewatch | 6 | Rare | €0.38 |
| Matter ReshaperOath of the Gatewatch Promos · 6s | Oath of the Gatewatch Promos | 6s | Rare | €2.00 |
| Matter ReshaperSecret Lair Drop Tokens · 1048 | Secret Lair Drop Tokens | 1048 | Rare | €2.50 |
| Matter ReshaperExplorer Anthology 2 · 2 | Explorer Anthology 2 | 2 | Rare | — |
| Matt Linde BioWorld Championship Decks 1999 Tokens · ml0a | World Championship Decks 1999 Tokens | ml0a | — | $1.99 |
| Matt Linde DecklistWorld Championship Decks 1999 Tokens · ml0b | World Championship Decks 1999 Tokens | ml0b | — | $4.89 |
| Matt Murdock, Justice SeekerMarvel Super Heroes Commander · 602 | Marvel Super Heroes Commander | 602 | Rare | €1.00 |
| Matzalantli, the Great Door // The CoreThe Lost Caverns of Ixalan · 256 | The Lost Caverns of Ixalan | 256 | Rare | €2.08 |
| Matzalantli, the Great Door // The CoreThe Lost Caverns of Ixalan · 387 | The Lost Caverns of Ixalan | 387 | Rare | $3.26 |
| Mauhúr, Uruk-hai CaptainThe Lord of the Rings: Tales of Middle-earth · 214 | The Lord of the Rings: Tales of Middle-earth | 214 | Uncommon | €0.15 |
| Mauhúr, Uruk-hai CaptainThe Lord of the Rings: Tales of Middle-earth · 665 | The Lord of the Rings: Tales of Middle-earth | 665 | Uncommon | €0.38 |
| Maular, the Next EvolutionMystery Booster Commander Edition · 31 | Mystery Booster Commander Edition | 31 | Rare | €9.71 |
| Maulfist DoorbusterKaladesh · 123 | Kaladesh | 123 | Uncommon | €0.04 |
| Maulfist RevolutionaryAether Revolt · 115 | Aether Revolt | 115 | Uncommon | $0.06 |
| Maulfist RevolutionaryKaladesh Remastered · 168 | Kaladesh Remastered | 168 | Uncommon | — |
| Maulfist SquadKaladesh · 91 | Kaladesh | 91 | Common | €0.02 |
| Maulfist SquadKaladesh Remastered · 99 | Kaladesh Remastered | 99 | Common | — |
| Maul of the SkyclavesFoundations Jumpstart · 223 | Foundations Jumpstart | 223 | Rare | $0.31 |
| Maul of the SkyclavesMarch of the Machine Commander · 195 | March of the Machine Commander | 195 | Rare | €0.31 |
| Maul of the SkyclavesPhyrexia: All Will Be One Commander · 80 | Phyrexia: All Will Be One Commander | 80 | Rare | €0.27 |
| Maul of the SkyclavesZendikar Rising Promos · 27p | Zendikar Rising Promos | 27p | Rare | $0.34 |
| Maul of the SkyclavesZendikar Rising Promos · 27s | Zendikar Rising Promos | 27s | Rare | €0.87 |
| Maul of the SkyclavesZendikar Rising · 27 | Zendikar Rising | 27 | Rare | €0.13 |
| Maul of the SkyclavesZendikar Rising · 320 | Zendikar Rising | 320 | Rare | €0.47 |
| Maul of the SkyclavesMagic Online Promos · 83762 | Magic Online Promos | 83762 | Rare | — |
| Maul SplicerDCI Promos · 72 | DCI Promos | 72 | Rare | €0.23 |
| Maul SplicerNew Phyrexia · 114 | New Phyrexia | 114 | Common | €0.16 |
| Maul SplicerMagic Online Promos · 40084 | Magic Online Promos | 40084 | Common | — |
| Mausoleum GuardDuel Decks: Sorin vs. Tibalt · 13 | Duel Decks: Sorin vs. Tibalt | 13 | Uncommon | $0.08 |
| Mausoleum GuardInnistrad Remastered · 33 | Innistrad Remastered | 33 | Uncommon | €0.10 |
| Mausoleum GuardInnistrad · 20 | Innistrad | 20 | Uncommon | €0.04 |