| Mjölnir's Might (8 variants) | 697 |
| MJ, Rising Star (8 variants) | 773 |
| Mister Immortal (8 variants) | 727 |
| Mister Fantastic | 876 |
| Mister Fantastic (8 variants) | 2 |
| Mist-Cloaked Herald (12 variants) | 760 |
| Mirage Mirror (4 variants) | 443 |
| Mirage Mirror (12 variants) | 206 |
| Minotaur, Roxxon CEO (12 variants) | 539 |
| Minion Missile (8 variants) | 663 |
| Mind's Eye (12 variants) | 288 |
| Mind's Eye (4 variants) | 447 |
| Mind's Dilation (12 variants) | 277 |
| Mind's Dilation (4 variants) | 344 |
| Midnight Angel Armor (12 variants) | 22 |
| Midnight Angel Armor (4 variants) | 316 |
| Methods of the Mighty (4 variants) | 315 |
| Methods of the Mighty (12 variants) | 21 |
| Meteor Golem (12 variants) | 205 |
| Metalwork Colossus (12 variants) | 204 |
| Metalwork Colossus (4 variants) | 442 |
| Metallic Mimic (4 variants) | 441 |
| Metallic Mimic (12 variants) | 203 |
| Medusa, Inhuman Queen (12 variants) | 68 |
| Medusa, Inhuman Queen (4 variants) | 383 |
| Matt Murdock, Justice Seeker (8 variants) | 602 |
| Masked Meower (8 variants) | 807 |
| Marvelous Melee (12 variants) | 549 |
| Marvel Boy, Noh-Varr (8 variants) | 743 |
| Martial Coup (12 variants) | 138 |
| Martial Coup (4 variants) | 314 |
| Mandroid Squadron (6 variants) | 841 |
| Make Your Move (12 variants) | 137 |
| Madame Hydra, Reanimated (12 variants) | 538 |
| Machine Man, Model X-51 (8 variants) | 751 |
| MACH-1, Swooping Scoundrel (8 variants) | 662 |
| M'Baku, Jabari Chieftain (12 variants) | 67 |
| M'Baku, Jabari Chieftain (4 variants) | 382 |
| M.O.D.O.K., Evil Intellect (8 variants) | 509 |
| Luxury Suite (4 variants) | 482 |
| Luxury Suite (12 variants) | 252 |
| Lurking Lizards (8 variants) | 816 |
| Luke Cage, Hero for Hire (8 variants) | 696 |
| Lucky the Pizza Dog (8 variants) | 726 |
| Loyal Retainers (4 variants) | 313 |
| Loyal Retainers (12 variants) | 136 |
| Loyal Guardian (12 variants) | 176 |
| Love on the Battlefield (4 variants) | 408 |
| Love on the Battlefield (12 variants) | 87 |
| Loki's Scepter (12 variants) | 56 |