| Magikey Spirit - VepartuBurst of Destiny · 047 | Burst of Destiny | 047 | Super Rare | €0.06 |
| Magikey UnlockingDawn of Majesty · 073 | Dawn of Majesty | 073 | Common | €0.02 |
| Magikey WorldDawn of Majesty · 057 | Dawn of Majesty | 057 | Ultra Rare | €0.10 |
| MagikuribohBattle of Chaos · 001 | Battle of Chaos | 001 | Super Rare | €0.48 |
| Magi Magi ☆ Magician GalUnlisted Printings | Unlisted Printings | — | — | $74.15 |
| Maginificent Magikey MaftealBurst of Destiny · 021 | Burst of Destiny | 021 | Common | $0.06 |
| Magister of EndymionStructure Deck: Order of the Spellcasters · 003 | Structure Deck: Order of the Spellcasters | 003 | Common | €0.38 |
| Magistery AlchemistLegendary Duelists: Magical Hero · 016 | Legendary Duelists: Magical Hero | 016 | Super Rare | $0.09 |
| Magistus ChorozoSupreme Darkness · 100 | Supreme Darkness | 100 | Super Rare | €2.79 |
| Magistus InvocationGenesis Impact · 011 | Genesis Impact | 011 | Rare | €0.14 |
| Magistus TheurgyGenesis Impact · 010 | Genesis Impact | 010 | Rare | €0.05 |
| Magistus VritraGenesis Impact · 012 | Genesis Impact | 012 | Rare | €0.04 |
| Magmacho DragonPhantom Nightmare · 025 | Phantom Nightmare | 025 | Common | €0.02 |
| Magma DragonCrossed Souls · 034 | Crossed Souls | 034 | Common | €0.05 |
| Magna DragoStarter Deck: Yu-Gi-Oh! 5D's · 013 | Starter Deck: Yu-Gi-Oh! 5D's | 013 | Common | €0.05 |
| Magnarokket DragonCircuit Break · 011 | Circuit Break | 011 | Ultra Rare | €0.21 |
| Magna-Slash DragonForce of the Breaker · 029 | Force of the Breaker | 029 | Common | €0.06 |
| Magnet BondingBurst Protocol · 053 | Burst Protocol | 053 | Common | €0.10 |
| Magnet Circle LV2Shadow of Infinity · 038 | Shadow of Infinity | 038 | Common | €0.02 |
| Magnet ConversionStructure Deck: Yugi Muto · 035 | Structure Deck: Yugi Muto | 035 | Common | €0.10 |
| Magnet ForceDuelist Pack: Rivals of the Pharaoh · 007 | Duelist Pack: Rivals of the Pharaoh | 007 | Super Rare | €0.19 |
| Magnetic AttractionSpeed Duel: Battle City Box · 15 | Speed Duel: Battle City Box | 15 | Common | €0.10 |
| Magnetic FieldStructure Deck: Yugi Muto · 024 | Structure Deck: Yugi Muto | 024 | Common | €0.10 |
| Magnetic MosquitoPhantom Darkness · 039 | Phantom Darkness | 039 | Common | $0.07 |
| Magnet InductionKing's Court · 009 | King's Court | 009 | Super Rare | €0.36 |
| Magnet ReverseDuelist Pack: Rivals of the Pharaoh · 006 | Duelist Pack: Rivals of the Pharaoh | 006 | Super Rare | €0.28 |
| Magnet Warrior Omega PlusMaze of Muertos · 054 | Maze of Muertos | 054 | Super Rare | €0.37 |
| Magnet Warrior Sigma MinusBurst Protocol · 006 | Burst Protocol | 006 | Common | €0.10 |
| Magnet Warrior Sigma PlusBurst Protocol · 005 | Burst Protocol | 005 | Common | €0.12 |
| Magnificent Machine AngelLegendary Duelists: Sisters of the Rose · 016 | Legendary Duelists: Sisters of the Rose | 016 | Rare | €0.02 |
| Magnum ShieldLord of the Tachyon Galaxy · 058 | Lord of the Tachyon Galaxy | 058 | Common | €0.20 |
| Magnum the RelieverDuelist Nexus · 036 | Duelist Nexus | 036 | Super Rare | €0.27 |
| Mahaama the Fairy DragonPhantom Rage · 081 | Phantom Rage | 081 | Common | €0.12 |
| MaharaghiLegacy of Darkness · 064 | Legacy of Darkness | 064 | Short Print | €0.19 |
| Maha VailoMagic Ruler · 012 | Magic Ruler | 012 | Super Rare | €0.04 |
| Maha Vailo, Light of the HeavensBlazing Vortex · 024 | Blazing Vortex | 024 | Super Rare | €0.10 |
| Mahjong Munia MaidensExtreme Force · 030 | Extreme Force | 030 | Common | €0.03 |
| MahunderReturn of the Duelist · 096 | Return of the Duelist | 096 | Rare | €0.43 |
| Maiden in LoveMaze of Muertos · 020 | Maze of Muertos | 020 | Super Rare | €0.11 |
| Maiden of Blue TearsMaze of the Master · 031 | Maze of the Master | 031 | New | €0.14 |
| Maiden of MacabreThe Duelist Genesis · 084 | The Duelist Genesis | 084 | Rare | €0.15 |
| Maiden of the AquaPharaonic Guardian · 008 | Pharaonic Guardian | 008 | Short Print | €0.21 |
| Maiden of the Millennium MoonThe Infinite Forbidden · 004 | The Infinite Forbidden | 004 | Common | €0.04 |
| Maiden of the MoonlightTournament Pack: 2nd Season · 023 | Tournament Pack: 2nd Season | 023 | Common | €7.59 |
| Maiden of WhiteStructure Deck: Blue-Eyes White Destiny · 041 | Structure Deck: Blue-Eyes White Destiny | 041 | Ultra Rare | €0.21 |
| Maiden with Eyes of BlueSaga of Blue-Eyes White Dragon Structure Deck · 006 | Saga of Blue-Eyes White Dragon Structure Deck | 006 | Super Rare | €0.12 |
| Maize TokenUnlisted Printings | Unlisted Printings | — | — | — |
| Majespecter Cat - NekomataDimension of Chaos · 025 | Dimension of Chaos | 025 | Super Rare | $0.24 |
| Majespecter Crow - YataDimension of Chaos · 027 | Dimension of Chaos | 027 | Common | €0.09 |
| Majespecter CycloneDimension of Chaos · 060 | Dimension of Chaos | 060 | Super Rare | $0.15 |