| Persistent Constrictor (7 variants) | 52 |
| Overwhelming Stampede (6 variants) | 192 |
| Oversimplify (6 variants) | 228 |
| Overflowing Basin (6 variants) | 293 |
| Otherworldly Gaze (6 variants) | 122 |
| Orzhov Signet (6 variants) | 249 |
| Orzhov Basilica (6 variants) | 292 |
| Only I Know What Awaits (6 variants) | 350 |
| One with the Multiverse (6 variants) | 121 |
| Ondu Spiritdancer (6 variants) | 101 |
| Old Stickfingers (6 variants) | 227 |
| Obsessive Skinner (6 variants) | 191 |
| Obscura Storefront (6 variants) | 291 |
| Ob Nixilis Reignited (6 variants) | 152 |
| Nyx Weaver (6 variants) | 226 |
| Noxious Gearhulk (6 variants) | 151 |
| No Secret Is Hidden from Me (6 variants) | 349 |
| Nightshade Harvester (6 variants) | 150 |
| Nightmare Shepherd (6 variants) | 149 |
| Night's Whisper (6 variants) | 79 |
| Necroblossom Snarl (6 variants) | 290 |
| Myriad Landscape (6 variants) | 289 |
| My Wings Enfold All (6 variants) | 348 |
| My Will Is Irresistible (6 variants) | 347 |
| My Wealth Will Bury You (6 variants) | 346 |
| My Tendrils Run Deep (6 variants) | 345 |
| My Laughter Echoes (6 variants) | 344 |
| My Followers Ascend (6 variants) | 343 |
| My Crushing Masterstroke (6 variants) | 342 |
| My Champion Stands Supreme (6 variants) | 341 |
| Multani, Yavimaya's Avatar (6 variants) | 190 |
| Mulch (6 variants) | 189 |
| Mosswort Bridge (6 variants) | 288 |
| Morbid Opportunist (6 variants) | 148 |
| Moon-Blessed Cleric (6 variants) | 69 |
| Monologue Tax (6 variants) | 100 |
| Moldgraf Monstrosity (6 variants) | 83 |
| Moldgraf Millipede (6 variants) | 188 |
| Mogis, God of Slaughter (6 variants) | 89 |
| Mirrormade (6 variants) | 120 |
| Mine Is the Only Truth (6 variants) | 340 |
| Mind Stone (6 variants) | 248 |
| Metamorphosis Fanatic (7 variants) | 51 |
| Metamorphosis Fanatic (6 variants) | 21 |
| Mesa Enchantress (6 variants) | 68 |
| Mayhem Devil (6 variants) | 225 |
| Massacre Wurm (6 variants) | 147 |
| Massacre Girl (6 variants) | 146 |
| Mask of Griselbrand (6 variants) | 145 |
| Llanowar Wastes (6 variants) | 287 |