| One With the WindJumpstart 2022 · 330 | Jumpstart 2022 | 330 | Common | €0.11 |
| One With the WindIxalan · 64 | Ixalan | 64 | Common | €0.06 |
| Only Blood Ends Your NightmaresArchenemy Schemes · 34★ | Archenemy Schemes | 34★ | Common | €0.71 |
| Only I Know What AwaitsDuskmourn: House of Horror Commander · 350 | Duskmourn: House of Horror Commander | 350 | Common | $0.28 |
| OnslaughtExodus · 92 | Exodus | 92 | Common | €0.13 |
| OnslaughtThe List Tokens · EXO-92 | The List Tokens | EXO-92 | Common | €0.12 |
| On the JobMurders at Karlov Manor · 30 | Murders at Karlov Manor | 30 | Common | €0.05 |
| On the JobMurders at Karlov Manor · 292 | Murders at Karlov Manor | 292 | Common | €0.04 |
| OnuletMasters Edition · 161 | Masters Edition | 161 | Common | — |
| OnuletMasters Edition IV · 219 | Masters Edition IV | 219 | Common | — |
| Onyx GobletShards of Alara · 81 | Shards of Alara | 81 | Common | €0.08 |
| Onyx GobletSalvat 2011 · 79 | Salvat 2011 | 79 | Common | €0.06 |
| Ood SphereDoctor Who · 594 | Doctor Who | 594 | Common | €0.27 |
| Oona's GatewardenShadowmoor · 173 | Shadowmoor | 173 | Common | $0.24 |
| Oona's GraceCommander 2019 · 91 | Commander 2019 | 91 | Common | $0.12 |
| Oona's GraceEternal Masters · 63 | Eternal Masters | 63 | Common | €0.13 |
| Oona's GraceEventide · 27 | Eventide | 27 | Common | €0.13 |
| Opal CaryatidUrza's Saga · 24 | Urza's Saga | 24 | Common | $0.10 |
| Opal ChampionUrza's Legacy · 16 | Urza's Legacy | 16 | Common | €0.09 |
| Opal GargoyleUrza's Saga · 25 | Urza's Saga | 25 | Common | €0.07 |
| Opaline BracersFifth Dawn · 141 | Fifth Dawn | 141 | Common | €0.09 |
| Opaline UnicornConspiracy: Take the Crown · 213 | Conspiracy: Take the Crown | 213 | Common | €0.10 |
| Opaline UnicornTheros · 218 | Theros | 218 | Common | €0.11 |
| Opal Lake GatekeepersDragon's Maze · 16 | Dragon's Maze | 16 | Common | $0.06 |
| Opal Lake GatekeepersThe List Tokens · DGM-16 | The List Tokens | DGM-16 | Common | €0.04 |
| Opal Lake GatekeepersPioneer Masters · 68 | Pioneer Masters | 68 | Common | — |
| Opal PalaceWarhammer 40,000 Commander · 286 | Warhammer 40,000 Commander | 286 | Common | €0.22 |
| Opal PalaceWarhammer 40,000 Commander · 286★ | Warhammer 40,000 Commander | 286★ | Common | $2.82 |
| Opal PalaceCommander 2013 · 310 | Commander 2013 | 310 | Common | €0.14 |
| Opal PalaceCommander 2016 · 312 | Commander 2016 | 312 | Common | €0.20 |
| Opal PalaceCommander 2017 · 266 | Commander 2017 | 266 | Common | €0.20 |
| Opal PalaceCommander 2021 · 306 | Commander 2021 | 306 | Common | €0.20 |
| Opal PalaceCommander Anthology Volume II · 259 | Commander Anthology Volume II | 259 | Common | €0.20 |
| Opal PalaceCommander Anthology · 262 | Commander Anthology | 262 | Common | $0.13 |
| Opal PalaceCommander Legends · 352 | Commander Legends | 352 | Common | €0.16 |
| Opal PalaceCommander Masters · 422 | Commander Masters | 422 | Common | €0.16 |
| Opal PalaceCommander Legends · 707 | Commander Legends | 707 | Common | €0.60 |
| Opal PalaceLorwyn Eclipsed Commander · 156 | Lorwyn Eclipsed Commander | 156 | Common | €0.10 |
| Opal PalaceKaldheim Commander · 116 | Kaldheim Commander | 116 | Common | €0.13 |
| Opal PalaceModern Horizons 3 Commander · 361 | Modern Horizons 3 Commander | 361 | Common | €0.16 |
| Opal PalaceNeon Dynasty Commander · 172 | Neon Dynasty Commander | 172 | Common | €0.25 |
| Opal PalaceSecrets of Strixhaven Commander · 390 | Secrets of Strixhaven Commander | 390 | Common | €0.15 |
| Opal PalaceMagic Online Promos · 86114 | Magic Online Promos | 86114 | Common | — |
| Open FireHour of Devastation · 105 | Hour of Devastation | 105 | Common | €0.04 |
| Open FireFoundations Jumpstart · 583 | Foundations Jumpstart | 583 | Common | €0.06 |
| Open FireAmonkhet Remastered · 169 | Amonkhet Remastered | 169 | Common | — |
| Open the GatesRavnica Allegiance · 133 | Ravnica Allegiance | 133 | Common | €0.13 |
| Open the GatesRavnica Remastered · 151 | Ravnica Remastered | 151 | Common | €0.08 |
| Open the OmenpathsKaldheim · 143 | Kaldheim | 143 | Common | €0.11 |
| OphidianDuel Decks: Jace vs. Chandra · 9 | Duel Decks: Jace vs. Chandra | 9 | Common | $0.15 |