| 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 |
| 1 | Ochre Jelly | MTGAFR_196 |
| 1 | Octavia, Living Thesis | MTGC21_029 |
| 4+ | Octoprophet | MTGCore Set 2020_070 |
| 1 | Octopus Umbra | MTGTheList_070 |
| 4+ | Ocular Halo | MTGDissension_028 |
| 4+ | Ocular Halo (FOIL) | MTGDissension_028F |
| 4+ | Oculus | MTGMirrodinBesieged_029 |
| 1 | Oculus Whelp (Foil) | MTGMOM_069F |
| 4+ | Odds // Ends | MTGDissension_153 |
| 1 | Odds // Ends | MTGTheList_240 |
| 4+ | Odious Trow | MTGEventide_125 |
| 1 | Odious Trow FOIL | MTGEventide_125F |
| 3 | Odric, Lunarch Marshal | MTGCommander2020_095 |
| 2 | Odric, Lunarch Marshal | MTGDMC_103 |
| 4+ | Odric, Lunarch Marshal (Commander Deck) | MTGCMR_379 |
| 2 | Odric, Master Tactician | MTGMagic2013_023 |
| 4+ | Odric, Master Tactician | MTGCommander2020_096 |
| 3 | Odric, Master Tactician | MTGMIC_090 |
| 4+ | Odric's Outrider | MTGMID_029 |
| 4+ | Odunos River Trawler | MTGBornofGods_079 |
| 4+ | Odylic Wraith | MTGWTH_077 |
| 4+ | Of One Mind | MTGIkoria_060 |
| 4+ | Off Balance | MTGNemesis_015 |
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