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- Mine, Mine, Mine! — UGL 65 Unglued
- Monkey Monkey Monkey — UNH 104★ Unhinged
- Monkey Monkey Monkey — UNH 104 Unhinged
- Chosen of Markov // Markov's Servant — DKA 55 Dark Ascension
- Chosen of Markov // Markov's Servant — DKA 55 Dark Ascension
- Éomer, Marshal of Rohan — LTR 120 The Lord of the Rings: Tales of Middle-earth
- Éomer, Marshal of Rohan — LTR 428 The Lord of the Rings: Tales of Middle-earth
- Éomer, Marshal of Rohan — PLTR 120s Tales of Middle-earth Promos
- Éomer, Marshal of Rohan — LTR 571 The Lord of the Rings: Tales of Middle-earth
- Estrid, the Masked // Estrid, the Masked — SLD 1327 Secret Lair Drop
- Estrid, the Masked // Estrid, the Masked — SLD 1327 Secret Lair Drop
- Glóin the Mighty // Easy Pickings — HOB 227 The Hobbit
- Glóin the Mighty // Easy Pickings — HOB 263 The Hobbit
- Glóin the Mighty // Easy Pickings — HOB 99 The Hobbit
- Magmatic Hellkite // Magmatic Hellkite — TDM 380 Tarkir: Dragonstorm
- Magmatic Hellkite // Magmatic Hellkite — TDM 380 Tarkir: Dragonstorm
- Maître Tree — UNK RG03a Unknown Event
- Makindi Stampede // Makindi Mesas — ZNR 26 Zendikar Rising
- Makindi Stampede // Makindi Mesas — ZNR 26 Zendikar Rising
- Malakir Rebirth // Malakir Mire — ZNR 111 Zendikar Rising
- Malakir Rebirth // Malakir Mire — ZNR 111 Zendikar Rising
- Marang River Regent // Coil and Catch // Marang River Regent // Coil and Catch — TDM 378 Tarkir: Dragonstorm
- Marang River Regent // Coil and Catch // Marang River Regent // Coil and Catch — TDM 378 Tarkir: Dragonstorm
- Márton Stromgald — ME1 104 Masters Edition
- Márton Stromgald — ICE 199 Ice Age
- Mauhúr, Uruk-hai Captain — LTR 214 The Lord of the Rings: Tales of Middle-earth
- Mauhúr, Uruk-hai Captain — LTR 665 The Lord of the Rings: Tales of Middle-earth
- Mechtitan Core // Mechtitan Core — SLD 1965 Secret Lair Drop
- Mechtitan Core // Mechtitan Core — SLD 1965 Secret Lair Drop
- Megatron, Tyrant // Megatron, Destructive Force — BOT 12 Transformers
- Megatron, Tyrant // Megatron, Destructive Force — BOT 26 Transformers
- Megatron, Tyrant // Megatron, Destructive Force — BOT 12 Transformers
- Megatron, Tyrant // Megatron, Destructive Force — BOT 26 Transformers
- Michiko's Reign of Truth // Portrait of Michiko — NEO 29 Kamigawa: Neon Dynasty
- Michiko's Reign of Truth // Portrait of Michiko — NEO 29 Kamigawa: Neon Dynasty
- Mirror Mirror — OLEP 48 Oversized League Prizes
- Mirror Mirror — UGL 77 Unglued
- Mishra, Claimed by Gix // Mishra, Lost to Phyrexia — BRO 216 The Brothers' War
- Mishra, Claimed by Gix // Mishra, Lost to Phyrexia — PBRO 216s The Brothers' War Promos
- Mists of Lórien — LTC 545 Tales of Middle-earth Commander
- Mists of Lórien — LTC 501 Tales of Middle-earth Commander
- Mjölnir, Hammer of Thor — MSH 303 Marvel Super Heroes
- Mjölnir, Hammer of Thor — MSH 339 Marvel Super Heroes
- Mjölnir, Hammer of Thor — MSH 146 Marvel Super Heroes
- Mjölnir, Storm Hammer — ACR 258 Assassin's Creed
- Mjölnir, Storm Hammer — ACR 74 Assassin's Creed
- Mjölnir, Storm Hammer — ACR 170 Assassin's Creed
- Mjölnir's Might — MSC 697 Marvel Super Heroes Commander
- Monitor Monitor — UNF 338 Unfinity
- Monitor Monitor — UNF 52 Unfinity