| Memory Crush KingThe Shining Darkness · 029 | The Shining Darkness | 029 | Common | $0.11 |
| Memory LossLord of the Tachyon Galaxy · 070 | Lord of the Tachyon Galaxy | 070 | Common | €0.04 |
| Memory of an AdversaryAbyss Rising · 075 | Abyss Rising | 075 | Super Rare | $0.25 |
| Mental SeekerExtreme Victory · 024 | Extreme Victory | 024 | Common | €0.05 |
| Mental TunerPhoton Hypernova · 012 | Photon Hypernova | 012 | Common | $0.07 |
| MeotokoLegendary Collection 4: Joey's World Mega Pack · 013 | Legendary Collection 4: Joey's World Mega Pack | 013 | Common | $1.32 |
| MeowseclickBurst of Destiny · 034 | Burst of Destiny | 034 | Super Rare | €0.05 |
| Merciful Machine AngelLegendary Duelists: Sisters of the Rose · 014 | Legendary Duelists: Sisters of the Rose | 014 | Super Rare | €0.11 |
| Merciless Scorpion of SerketMaze of the Master · 002 | Maze of the Master | 002 | Ultra Rare | €0.65 |
| Mercurium the Living QuicksilverBurst Protocol · 084 | Burst Protocol | 084 | Ultra Rare | €0.70 |
| Mereologic AggregatorDarkwing Blast · 046 | Darkwing Blast | 046 | Super Rare | €0.13 |
| MerlinNoble Knights of the Round Table Box Set · 001 | Noble Knights of the Round Table Box Set | 001 | Platinum Rare | $1.01 |
| Mermaid ArcherRaging Battle · 036 | Raging Battle | 036 | Common | €0.18 |
| Mermaid KnightAncient Sanctuary · 025 | Ancient Sanctuary | 025 | Common | €0.16 |
| Mermaid SharkPrimal Origin · 005 | Primal Origin | 005 | Rare | €0.46 |
| Mermail AbyssalaciaDark Neostorm · 094 | Dark Neostorm | 094 | Ultra Rare | $0.33 |
| Mermail AbyssbalaenLord of the Tachyon Galaxy · 083 | Lord of the Tachyon Galaxy | 083 | Ultra Rare | $0.25 |
| Mermail AbyssdineCosmo Blazer · 032 | Cosmo Blazer | 032 | Super Rare | $1.54 |
| Mermail AbyssgaiosAbyss Rising · 046 | Abyss Rising | 046 | Ultra Rare | €0.02 |
| Mermail AbyssgundeAbyss Rising · 015 | Abyss Rising | 015 | Rare | €0.06 |
| Mermail AbysshildeAbyss Rising · 016 | Abyss Rising | 016 | Common | $0.17 |
| Mermail AbyssleedCosmo Blazer · 034 | Cosmo Blazer | 034 | Secret Rare | $0.23 |
| Mermail AbysslindeAbyss Rising · 014 | Abyss Rising | 014 | Ultra Rare | €0.10 |
| Mermail AbysslungAbyss Rising · 019 | Abyss Rising | 019 | Common | €0.14 |
| Mermail AbyssmanderAbyss Rising · 081 | Abyss Rising | 081 | Rare | $0.17 |
| Mermail AbyssmegaloAbyss Rising · 020 | Abyss Rising | 020 | Secret Rare | €0.09 |
| Mermail AbyssnereiCircuit Break · 028 | Circuit Break | 028 | Common | €0.09 |
| Mermail AbyssnoseCosmo Blazer · 033 | Cosmo Blazer | 033 | Common | €0.13 |
| Mermail AbyssoceaLord of the Tachyon Galaxy · 030 | Lord of the Tachyon Galaxy | 030 | Common | €0.20 |
| Mermail AbysspikeAbyss Rising · 018 | Abyss Rising | 018 | Rare | $0.13 |
| Mermail AbyssteusCosmo Blazer · 083 | Cosmo Blazer | 083 | Ultra Rare | $0.12 |
| Mermail AbysstriteCosmo Blazer · 050 | Cosmo Blazer | 050 | Super Rare | €5.34 |
| Mermail AbyssturgeAbyss Rising · 017 | Abyss Rising | 017 | Rare | €0.39 |
| Mermail King - NeptabyssRage of the Abyss · 046 | Rage of the Abyss | 046 | Ultra Rare | $0.14 |
| Mermail Shadow SquadRage of the Abyss · 018 | Rage of the Abyss | 018 | Ultra Rare | €0.69 |
| Merry MelffysPower of the Elements · 045 | Power of the Elements | 045 | Common | €0.03 |
| Mesmeric ControlYu-Gi-Oh! The Dawn of Destiny promotional cards · 001 | Yu-Gi-Oh! The Dawn of Destiny promotional cards | 001 | Super Rare | €0.13 |
| Message in a BottleZexal Collection Tin · 015 | Zexal Collection Tin | 015 | Super Rare | €0.29 |
| Messenger of PeaceMagic Ruler · 102 | Magic Ruler | 102 | Super Rare | $0.39 |
| Metabo GlobsterPhantom Darkness · 085 | Phantom Darkness | 085 | Rare | €0.05 |
| Metabo-SharkStardust Overdrive · 086 | Stardust Overdrive | 086 | Super Rare | €0.24 |
| Metabo TokenUnlisted Printings | Unlisted Printings | — | — | — |
| Metaion, the TimelordPhoton Shockwave · 098 | Photon Shockwave | 098 | Secret Rare | $0.32 |
| Metal Armored BugAncient Sanctuary · 005 | Ancient Sanctuary | 005 | Common | €0.04 |
| Metal DetectorPharaoh's Servant · 022 | Pharaoh's Servant | 022 | Common | €0.02 |
| Metal DragonLegend of Blue Eyes White Dragon · 102 | Legend of Blue Eyes White Dragon | 102 | Rare | €0.05 |
| Metal Fiend TokenUnlisted Printings | Unlisted Printings | — | — | €2.19 |
| Metal FishMagic Ruler · 007 | Magic Ruler | 007 | Common | €0.05 |
| Metalflame SwordsmanSupreme Darkness · 014 | Supreme Darkness | 014 | Ultra Rare | €0.27 |
| Metalfoes AdamanteThe Dark Illusion · 043 | The Dark Illusion | 043 | Rare | €0.08 |