| Mausoleum Guard (7 variants) | 213 |
| Mechanized Production (7 variants) | 320 |
| Memorial to Genius (7 variants) | 815 |
| Merfolk Pupil (7 variants) | 15 |
| Merfolk Sovereign (7 variants) | 321 |
| Merrow Reejerey (7 variants) | 61 |
| Mesa Lynx (7 variants) | 214 |
| Meteor Golem (7 variants) | 786 |
| Michiko Konda, Truth Seeker (7 variants) | 215 |
| Midnight Guard (7 variants) | 216 |
| Might of the Masses (7 variants) | 690 |
| Mild-Mannered Librarian (7 variants) | 41 |
| Military Intelligence (7 variants) | 322 |
| Miraculous Recovery (7 variants) | 217 |
| Mire Blight (7 variants) | 442 |
| Mire Triton (7 variants) | 443 |
| Mirror Image (7 variants) | 62 |
| Mishra's Factory (7 variants) | 816 |
| Mistwalker (7 variants) | 323 |
| Mizzix, Replica Rider (7 variants) | 35 |
| Moldgraf Millipede (7 variants) | 691 |
| Moment of Craving (7 variants) | 444 |
| Moment of Triumph (7 variants) | 218 |
| Monkey Cage (7 variants) | 787 |
| Moodmark Painter (7 variants) | 445 |
| Moonfolk Puzzlemaker (7 variants) | 324 |
| Moonlight Hunt (7 variants) | 692 |
| Morkrut Banshee (7 variants) | 121 |
| Mortuary Mire (7 variants) | 817 |
| Mountain (7 variants) | 109 |
| Mountain (7 variants) | 107 |
| Mountain (7 variants) | 108 |
| Mudbutton Torchrunner (7 variants) | 574 |
| Multiple Choice (7 variants) | 325 |
| Murder Investigation (7 variants) | 219 |
| Muxus, Goblin Grandee (7 variants) | 575 |
| Mystic Skyfish (7 variants) | 326 |
| Naga Vitalist (7 variants) | 693 |
| Nantuko Cultivator (7 variants) | 694 |
| Necromancer's Stockpile (7 variants) | 446 |
| Necrotic Wound (7 variants) | 447 |
| Nessian Hornbeetle (7 variants) | 695 |
| Nest Robber (7 variants) | 576 |
| Nested Ghoul (7 variants) | 448 |
| Neutralize (7 variants) | 327 |
| Nezumi Bone-Reader (7 variants) | 122 |
| Nightguard Patrol (7 variants) | 220 |
| Nightpack Ambusher (7 variants) | 696 |
| Ninth Bridge Patrol (7 variants) | 221 |
| Nirkana Assassin (7 variants) | 449 |