| Myrkul, Lord of Bones | 544 |
| Myrkul, Lord of Bones (22 variants) | 433 |
| Myrkul, Lord of Bones (22 variants) | 287 |
| Myriad Landscape (10 variants) | 904 |
| Myconid Spore Tender (22 variants) | 243 |
| Mutavault (10 variants) | 903 |
| Murder (22 variants) | 134 |
| Multiclass Baldric (4 variants) | 644 |
| Multiclass Baldric (10 variants) | 684 |
| Mountain (22 variants) | 465 |
| Mountain (22 variants) | 463 |
| Mountain (22 variants) | 464 |
| Mountain (22 variants) | 466 |
| Mother of Runes (10 variants) | 702 |
| Mosswort Bridge (10 variants) | 902 |
| Mossfire Valley (10 variants) | 901 |
| Moss Diamond (22 variants) | 448 |
| Moss Diamond (22 variants) | 327 |
| Mortuary Mire (10 variants) | 900 |
| Morphic Pool (8 variants) | 603 |
| Morphic Pool (22 variants) | 357 |
| Moonshae Pixie // Pixie Dust (16 variants) | 84 |
| Monster Manual // Zoological Study (16 variants) | 242 |
| Monster Manual // Zoological Study (2 variants) | 591 |
| Mold Folk (22 variants) | 133 |
| Modify Memory (22 variants) | 83 |
| Mocking Doppelganger (10 variants) | 667 |
| Mocking Doppelganger (4 variants) | 617 |
| Mizzium Mortars (10 variants) | 803 |
| Mirror of Life Trapping (8 variants) | 599 |
| Mirror of Life Trapping (22 variants) | 326 |
| Mirror Entity (10 variants) | 701 |
| Minthara, Merciless Soul (22 variants) | 286 |
| Minthara, Merciless Soul (22 variants) | 432 |
| Minthara, Merciless Soul | 543 |
| Minsc & Boo, Timeless Heroes (22 variants) | 363 |
| Minsc & Boo, Timeless Heroes (22 variants) | 285 |
| Minimus Containment (22 variants) | 34 |
| Mindcrank (10 variants) | 866 |
| Mindblade Render (10 variants) | 762 |
| Mind Stone (22 variants) | 325 |
| Mind Flayer (10 variants) | 728 |
| Mikaeus, the Lunarch (10 variants) | 700 |
| Miirym, Sentinel Wyrm | 542 |
| Miirym, Sentinel Wyrm (22 variants) | 284 |
| Miirym, Sentinel Wyrm (22 variants) | 431 |
| Mighty Servant of Leuk-o (8 variants) | 598 |
| Mighty Servant of Leuk-o (22 variants) | 324 |
| Midnight Clock (10 variants) | 727 |
| Meteor Golem (22 variants) | 323 |