| Meteor Rush - MonochroidPhoton Hypernova · 029 | Photon Hypernova | 029 | Common | €0.02 |
| Meteo the MatchlessYu-Gi-Oh! World Championship 2004 prize cards · 402 | Yu-Gi-Oh! World Championship 2004 prize cards | 402 | Ultra Rare | — |
| MetrognomeRaging Tempest · 034 | Raging Tempest | 034 | Short Print | €0.02 |
| MezukiPremium Pack 2 (TCG) · 016 | Premium Pack 2 (TCG) | 016 | Secret Rare | €0.38 |
| Miasma Dragon TistinaDuelist's Advance · 020 | Duelist's Advance | 020 | Common | €0.07 |
| Miasma NecromancerDoom of Dimensions · 052 | Doom of Dimensions | 052 | Common | €0.06 |
| Michael, the Arch-LightswornRealm of Light Structure Deck · 036 | Realm of Light Structure Deck | 036 | Ultra Rare | €0.46 |
| Michion, the TimelordBattles of Legend: Relentless Revenge · 021 | Battles of Legend: Relentless Revenge | 021 | Ultra Rare | $4.49 |
| MichizurePharaoh's Servant · 051 | Pharaoh's Servant | 051 | Rare | €0.02 |
| Micro CoderYu-Gi-Oh! Legacy of the Duelist: Link Evolution promotional cards · 002 | Yu-Gi-Oh! Legacy of the Duelist: Link Evolution promotional cards | 002 | Ultra Rare | €0.05 |
| Micro RayAncient Sanctuary · 047 | Ancient Sanctuary | 047 | Common | €0.08 |
| Middle Age Mechs (Skill Card)Speed Duel GX: Duel Academy Box · 12 | Speed Duel GX: Duel Academy Box | 12 | Common | — |
| Midnight FiendUnlisted Printings | Unlisted Printings | — | — | — |
| Mid Shield GardnaThe Lost Millennium · 024 | The Lost Millennium | 024 | Rare | $0.20 |
| Mighty Dino King RexDuelist Nexus · 008 | Duelist Nexus | 008 | Super Rare | €0.11 |
| Mighty GuardRise of Destiny · 002 | Rise of Destiny | 002 | Common | €0.08 |
| Mighty WarriorLegacy of the Valiant · 096 | Legacy of the Valiant | 096 | Common | €0.12 |
| Migratory ZereortUnlisted Printings | Unlisted Printings | — | — | €0.04 |
| Mikanko Dance - MayowashidoriCyberstorm Access · 062 | Cyberstorm Access | 062 | Common | €0.06 |
| Mikanko Fire DanceAmazing Defenders · 030 | Amazing Defenders | 030 | Super Rare | €0.32 |
| Mikanko KaguraAmazing Defenders · 034 | Amazing Defenders | 034 | Rare | €0.03 |
| Mikanko PromiseAmazing Defenders · 035 | Amazing Defenders | 035 | Rare | €0.04 |
| Mikanko Purification DanceAmazing Defenders · 031 | Amazing Defenders | 031 | Rare | €0.11 |
| Mikanko Reflection RondoAmazing Defenders · 033 | Amazing Defenders | 033 | Rare | €0.12 |
| Mikanko RivalryAmazing Defenders · 036 | Amazing Defenders | 036 | Rare | €0.11 |
| Mikanko Shinbu - Noble TwinsMaze of Muertos · 019 | Maze of Muertos | 019 | Secret Rare | $0.99 |
| Mikanko SpiritwalkDuelist Nexus · 076 | Duelist Nexus | 076 | Common | €0.08 |
| Mikanko Water ArabesqueAmazing Defenders · 032 | Amazing Defenders | 032 | Ultra Rare | €3.01 |
| MikazukinoyaibaTournament Pack: 2nd Season · 006 | Tournament Pack: 2nd Season | 006 | Rare | $0.17 |
| Mikazukinoyaiba, the Moon Fang DragonLegacy of Destruction · 027 | Legacy of Destruction | 027 | Common | €0.05 |
| Mikumari the Banisher AshtraBeyond the Brave · 012 | Beyond the Brave | 012 | Secret Rare | €11.35 |
| Mild TurkeyMaximum Crisis · 095 | Maximum Crisis | 095 | Common | $0.09 |
| Milla the Temporal MagicianGeneration Force · 038 | Generation Force | 038 | Short Print | $0.11 |
| Millennium AnkhThe Infinite Forbidden · 053 | The Infinite Forbidden | 053 | Secret Rare | €1.30 |
| Millennium-Eyes IllusionistLegendary Duelists: Ancient Millennium · 001 | Legendary Duelists: Ancient Millennium | 001 | Ultra Rare | $1.31 |
| Millennium Eye (Skill Card)Speed Duel Starter Decks: Destiny Masters · 3 | Speed Duel Starter Decks: Destiny Masters | 3 | Common | $0.37 |
| Millennium-Eyes RestrictLegendary Duelists: Ancient Millennium · 003 | Legendary Duelists: Ancient Millennium | 003 | Ultra Rare | €0.02 |
| Millennium GolemTournament Pack 7 · 018 | Tournament Pack 7 | 018 | Common | €1.49 |
| Millennium Necklace (Skill Card)Speed Duel Starter Decks: Destiny Masters · 3 | Speed Duel Starter Decks: Destiny Masters | 3 | Common | €0.13 |
| Millennium RevelationLegendary Duelists: Rage of Ra · 006 | Legendary Duelists: Rage of Ra | 006 | Super Rare | €0.17 |
| Millennium ScorpionThe Lost Millennium · 009 | The Lost Millennium | 009 | Rare | $1.36 |
| Millennium SeekerEgyptian God Deck: Slifer the Sky Dragon · 005 | Egyptian God Deck: Slifer the Sky Dragon | 005 | Ultra Rare | $0.17 |
| Millennium ShieldMcDonald's Promotional Cards · 001 | McDonald's Promotional Cards | 001 | Ultra Rare | €0.30 |
| Million-Century Ice PrisonDuelist Nexus · 066 | Duelist Nexus | 066 | Common | €0.04 |
| Milus RadiantMetal Raiders · 110 | Metal Raiders | 110 | Rare | €0.06 |
| Mimesis ElephantPower of the Elements · 085 | Power of the Elements | 085 | Common | €0.04 |
| MimicatDragons of Legend 2 · 027 | Dragons of Legend 2 | 027 | Secret Rare | €0.59 |
| Mimicking Man-Eater BugBurst of Destiny · 029 | Burst of Destiny | 029 | Common | €0.10 |
| MimiclayThe New Challengers · 056 | The New Challengers | 056 | Common | €0.05 |
| Mimighoul ArchfiendThe Infinite Forbidden · 093 | The Infinite Forbidden | 093 | Super Rare | $0.19 |