| 4+ | Mentor of the Meek | MTGSCD_028 |
| 1 | Mentor's Guidance | MTGSTX_046 |
| 4+ | Mephidross Vampire | MTGFifthDawn_053 |
| 4+ | Mephitic Ooze | MTGDarksteel_047 |
| 4+ | Mephitic Vapors | MTGGuilds of Ravnica_076 |
| 1 | Mephitic Vapors (FOIL) | MTGGuilds of Ravnica_076F |
| 4+ | Mer-Ek Nightblade | MTGKhansofTarkir_079 |
| 2 | Mer-Ek Nightblade (FOIL) | MTGKhansofTarkir_079F |
| 4+ | Mercadia's Downfall | MTGMercMasq_205 |
| 4+ | Mercadian Atlas | MTGMercMasq_305 |
| 3 | Mercadian Atlas FOIL | MTGMercMasq_305F |
| 4+ | Mercadian Bazaar | MTGMercMasq_321 |
| 4+ | Mercadian Lift | MTGMercMasq_306 |
| 4+ | Mercenaries | MTGICE_044 |
| 4+ | Mercenary Informer | MTGProphecy_015 |
| 3 | Mercenary Knight | MTGPOR_099 |
| 1 | Merchant of Secrets | MTG8ED_090 |
| 4+ | Merchant of Secrets | MTGLegions_044 |
| 1 | Merchant of Secrets | MTGCommander2017_087 |
| 1 | Merchant of Secrets FOIL | MTGLegions_044F |
| 4+ | Merchant of the Vale // Haggle | MTGThrone of Eldraine_131 |
| 1 | Merchant of the Vale // Haggle (Alternate Art) | MTGThrone of Eldraine_293 |
| 1 | Merchant of the Vale // Haggle (Foil) | MTGThrone of Eldraine_131F |
| 4+ | Merchant of Truth | MTGMKC_011 |
| 1 | Merchant of Truth (Extended Art) | MTGMKC_322 |
| 4+ | Merchant Raiders | MTGCMR_081 |
| 4+ | Merchant Scroll | MTGHML_033 |
| 3 | Merchant's Dockhand | MTGAether Revolt_163 |
| 4+ | Merciless Eternal | MTGHour of Devastation_071 |
| 4+ | Merciless Eviction | MTGGatecrash_177 |
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