| Mesa Enchantress (2 variants) | 282 |
| Merfolk of the Pearl Trident | 714 |
| Meren of Clan Nel Toth | 52 |
| Merciless Executioner (2 variants) | 1025 |
| Mental Note | 2154 |
| Mental Misstep (2 variants) | 1179 |
| Mental Misstep (2 variants) | 2373 |
| Memory Lapse | 2142 |
| Memnarch (2 variants) | 1626 |
| Meltdown (2 variants) | 2296 |
| Megantic Sliver | 651 |
| Mechtitan Core // Mechtitan Core (2 variants) | 1965 |
| Mechtitan // Mechtitan (2 variants) | 1969 |
| Mechanized Production | 1841 |
| Meandering Towershell (2 variants) | 236 |
| Mazirek, Kraul Death Priest (2 variants) | 1418 |
| Mazirek, Kraul Death Priest (2 variants) | 1766 |
| Maze's End | 1834 |
| Mayhem Devil (2 variants) | 1715 |
| Mayael's Aria | 1848 |
| Maximus, Knight Apparent (2 variants) | 2449 |
| Max, the Daredevil (2 variants) | 345 |
| Matter Reshaper (2 variants) | 1048 |
| Masterwork of Ingenuity | 863 |
| Master of Waves (2 variants) | 1278 |
| Master of the Wild Hunt (2 variants) | 1249 |
| Master of the Feast | 7106 |
| Master of Cruelties (2 variants) | 1565 |
| Master of Ceremonies (2 variants) | 2379 |
| Massacre Girl (2 variants) | 1233 |
| Massacre (2 variants) | 9991 |
| Mass Hysteria (2 variants) | 1426 |
| Maskwood Nexus | 1904 |
| Mask of Memory (2 variants) | 2309 |
| Marwyn, the Nurturer | 1960 |
| Marrow-Gnawer | 34 |
| Maro | 719 |
| Maro | 718 |
| Marit Lage (2 variants) | 1681 |
| Marchesa, the Black Rose (2 variants) | 1452 |
| Marchesa, the Black Rose (2 variants) | 2009 |
| Manaweft Sliver | 650 |
| Manamorphose (2 variants) | 1746 |
| Managorger Hydra (2 variants) | 306 |
| Mana Vault | 796★ |
| Mana Geyser (2 variants) | 1821 |
| Mana Confluence (2 variants) | 1012a |
| Magus of the Wheel (2 variants) | 1166 |
| Magus of the Moon (2 variants) | 1761 |
| Magma Sliver | 641 |