| Murder Investigation (7 variants) | 219 |
| Multiple Choice (7 variants) | 325 |
| Mudbutton Torchrunner (7 variants) | 574 |
| Mountain (7 variants) | 109 |
| Mountain (7 variants) | 107 |
| Mountain (7 variants) | 108 |
| Mortuary Mire (7 variants) | 817 |
| Morkrut Banshee (7 variants) | 121 |
| Moonlight Hunt (7 variants) | 692 |
| Moonfolk Puzzlemaker (7 variants) | 324 |
| Moodmark Painter (7 variants) | 445 |
| Monkey Cage (7 variants) | 787 |
| Moment of Triumph (7 variants) | 218 |
| Moment of Craving (7 variants) | 444 |
| Moldgraf Millipede (7 variants) | 691 |
| Mizzix, Replica Rider (7 variants) | 35 |
| Mistwalker (7 variants) | 323 |
| Mishra's Factory (7 variants) | 816 |
| Mirror Image (7 variants) | 62 |
| Mire Triton (7 variants) | 443 |
| Mire Blight (7 variants) | 442 |
| Miraculous Recovery (7 variants) | 217 |
| Military Intelligence (7 variants) | 322 |
| Mild-Mannered Librarian (7 variants) | 41 |
| Might of the Masses (7 variants) | 690 |
| Midnight Guard (7 variants) | 216 |
| Michiko Konda, Truth Seeker (7 variants) | 215 |
| Meteor Golem (7 variants) | 786 |
| Mesa Lynx (7 variants) | 214 |
| Merrow Reejerey (7 variants) | 61 |
| Merfolk Sovereign (7 variants) | 321 |
| Merfolk Pupil (7 variants) | 15 |
| Memorial to Genius (7 variants) | 815 |
| Mechanized Production (7 variants) | 320 |
| Mausoleum Guard (7 variants) | 213 |
| Master's Rebuke (7 variants) | 689 |
| Master of the Wild Hunt (7 variants) | 688 |
| Massacre Wurm (7 variants) | 441 |
| Martyr's Soul (7 variants) | 212 |
| Markov Warlord (7 variants) | 573 |
| Marit Lage's Slumber (7 variants) | 319 |
| Mardu Heart-Piercer (7 variants) | 572 |
| Marauding Boneslasher (7 variants) | 440 |
| Marauding Blight-Priest (7 variants) | 439 |
| Mantle of Tides (7 variants) | 318 |
| Manakin (7 variants) | 785 |
| Mammoth Spider (7 variants) | 687 |
| Make a Stand (7 variants) | 211 |
| Magnifying Glass (7 variants) | 95 |
| Magnanimous Magistrate (7 variants) | 7 |