| 4+ | Obsessive Astronomer | MTGMID_152 |
| 2 | Obsessive Astronomer (Foil) | MTGMID_152F |
| 4+ | Obsessive Search | MTGTorment_043 |
| 1 | Obsessive Search (Foil) | MTGDMR_061F |
| 1 | Obsessive Search FOIL | MTGTorment_043F |
| 3 | Obsessive Stitcher | MTGCore Set 2021_223 |
| 3 | Obsessive Stitcher | MTGAFC_189 |
| 1 | Obsessive Stitcher (FOIL) | MTGCore Set 2021_223F |
| 1 | Obsianus Golem | MTG6ED_303 |
| 1 | Obsianus Golem | MTG2ED_268 |
| 4+ | Obsidian Acolyte | MTGInvasion_022 |
| 1 | Obsidian Acolyte FOIL | MTGInvasion_022F |
| 4+ | Obsidian Battle-Axe | MTGMorningtide_144 |
| 1 | Obsidian Battle-Axe FOIL | MTGMorningtide_144F |
| 4+ | Obsidian Charmaw | MTGMH2_137 |
| 4+ | Obsidian Fireheart | MTGZendikar_140 |
| 1 | Obsidian Fireheart | MTGArchenemyNicolBolas_055 |
| 1 | Obsidian Giant | MTGP02_109 |
| 3 | Obsidian Obelisk | MTGDMC_018 |
| 4+ | Obstinate Baloth | MTGMagic2011_188 |
| 1 | Obstinate Baloth | MTGIconicMasters_179 |
| 4+ | Obstinate Familiar | MTGOdyssey_210 |
| 4+ | Obuun, Mul Daya Ancestor (Foil) | MTGZNCommander_A088F |
| 4+ | Obzedat, Ghost Council | MTGGatecrash_182 |
| 4+ | Obzedat's Aid | MTGDragonsMaze_089 |
| 1 | Occult Epiphany | MTGVOC_014 |
| 4+ | Ochran Assassin | MTGGuilds of Ravnica_194 |
| 4+ | Octoprophet | MTGCore Set 2020_070 |
| 1 | Octopus Umbra | MTGTheList_070 |
| 4+ | Ocular Halo | MTGDissension_028 |
|
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