| Make a Stand (6 variants) | 222 |
| Malcator's Watcher (5 variants) | 324 |
| Malfunction (6 variants) | 325 |
| Maraleaf Rider (6 variants) | 686 |
| Markov Blademaster (6 variants) | 574 |
| Markov Enforcer (6 variants) | 575 |
| Markov Retribution (6 variants) | 576 |
| Markov Warlord (6 variants) | 577 |
| Marwyn, the Nurturer (6 variants) | 687 |
| Masked Blackguard (6 variants) | 459 |
| Maul of the Skyclaves (6 variants) | 223 |
| Memorial to Folly (6 variants) | 770 |
| Memorial to Genius (6 variants) | 771 |
| Memorial to Glory (6 variants) | 772 |
| Mentor of the Meek (6 variants) | 99 |
| Merfolk Branchwalker (6 variants) | 688 |
| Merfolk Pupil (6 variants) | 326 |
| Mesa Unicorn (6 variants) | 224 |
| Metalspinner's Puzzleknot (6 variants) | 755 |
| Midnight Assassin (6 variants) | 460 |
| Might of the Masses (6 variants) | 689 |
| Mikaeus, the Lunarch (6 variants) | 225 |
| Militant Inquisitor (6 variants) | 226 |
| Minotaur Sureshot (6 variants) | 578 |
| Mirran Bardiche (6 variants) | 227 |
| Mirrorwing Dragon (6 variants) | 579 |
| Moan of the Unhallowed (6 variants) | 461 |
| Mogg Flunkies (6 variants) | 580 |
| Moldgraf Millipede (6 variants) | 690 |
| Moment of Craving (6 variants) | 462 |
| Moment of Heroism (6 variants) | 228 |
| Moment of Triumph (6 variants) | 229 |
| Moodmark Painter (6 variants) | 463 |
| Moon-Circuit Hacker (6 variants) | 327 |
| Moonsnare Specialist (6 variants) | 328 |
| Morbid Opportunist (6 variants) | 464 |
| Morkrut Behemoth (6 variants) | 465 |
| Morkrut Necropod (6 variants) | 466 |
| Mountain (6 variants) | 91 |
| Mountain (6 variants) | 92 |
| Mountain (6 variants) | 90 |
| Mowu, Loyal Companion (6 variants) | 79 |
| Mu Yanling, Sky Dancer (6 variants) | 329 |
| Murasa Ranger (6 variants) | 691 |
| Murder (6 variants) | 467 |
| Murmuring Mystic (6 variants) | 107 |
| Muse Drake (6 variants) | 330 |
| Myr Enforcer (6 variants) | 756 |
| Mystic Skyfish (6 variants) | 331 |
| Naban, Dean of Iteration (6 variants) | 61 |