| Mowu, Loyal Companion (12 variants) | 306 |
| Mountain Valley (4 variants) | 1012 |
| Mountain (4 variants) | 796 |
| Mountain (14 variants) | 446 |
| Mountain (4 variants) | 795 |
| Mountain (14 variants) | 447 |
| Mountain (14 variants) | 448 |
| Mountain (4 variants) | 794 |
| Morophon, the Boundless (14 variants) | 3 |
| Morophon, the Boundless (5 variants) | 1058 |
| Morophon, the Boundless (7 variants) | 453 |
| Morophon, the Boundless (14 variants) | 669 |
| Molimo, Maro-Sorcerer (12 variants) | 305 |
| Mobilized District (4 variants) | 1011 |
| Mizzix of the Izmagnus (12 variants) | 348 |
| Mizzix of the Izmagnus (7 variants) | 586 |
| Mirrorpool (4 variants) | 1010 |
| Mirri, Weatherlight Duelist (12 variants) | 347 |
| Mirri, Weatherlight Duelist (7 variants) | 585 |
| Mire Triton (14 variants) | 174 |
| Mirari's Wake (4 variants) | 928 |
| Mirage Mirror (4 variants) | 962 |
| Ministrant of Obligation (14 variants) | 43 |
| Mindwrack Harpy (4 variants) | 869 |
| Minds Aglow (7 variants) | 491 |
| Minds Aglow (14 variants) | 105 |
| Mind Stone (4 variants) | 961 |
| Mikaeus, the Unhallowed (14 variants) | 173 |
| Mikaeus, the Unhallowed (5 variants) | 1061 |
| Mikaeus, the Unhallowed (7 variants) | 516 |
| Mikaeus, the Unhallowed (14 variants) | 675 |
| Might Sliver (4 variants) | 903 |
| Meteoric Mace (12 variants) | 243 |
| Meteor Golem (12 variants) | 399 |
| Metalwork Colossus (4 variants) | 960 |
| Mesa Enchantress (4 variants) | 828 |
| Meren of Clan Nel Toth (7 variants) | 584 |
| Meren of Clan Nel Toth (14 variants) | 685 |
| Meren of Clan Nel Toth (12 variants) | 346 |
| Melek, Izzet Paragon (12 variants) | 345 |
| Megantic Sliver (4 variants) | 901 |
| Mazemind Tome (4 variants) | 959 |
| Matter Reshaper (4 variants) | 806 |
| Mangara, the Diplomat (7 variants) | 466 |
| Mangara, the Diplomat (14 variants) | 42 |
| Manaweft Sliver (4 variants) | 900 |
| Makeshift Munitions (12 variants) | 242 |
| Magus of the Wheel (7 variants) | 544 |
| Magus of the Wheel (12 variants) | 241 |
| Magus of the Wheel (14 variants) | 643 |