| Origin of the Hidden OnesAssassin's Creed · 36 | Assassin's Creed | 36 | Uncommon | €0.09 |
| Origin of the HulkMarvel Super Heroes Commander · 728 | Marvel Super Heroes Commander | 728 | Uncommon | €0.23 |
| Origin of ThorMarvel Super Heroes Commander · 701 | Marvel Super Heroes Commander | 701 | Uncommon | €0.22 |
| Orim's PrayerTempest · 32 | Tempest | 32 | Uncommon | €0.34 |
| OrnitharchBorn of the Gods · 23 | Born of the Gods | 23 | Uncommon | €0.07 |
| OrnithopterRevised Edition · 270 | Revised Edition | 270 | Uncommon | $1.13 |
| OrnithopterFourth Edition Foreign Black Border · 341 | Fourth Edition Foreign Black Border | 341 | Uncommon | €3.49 |
| OrnithopterTenth Edition · 336 | Tenth Edition | 336 | Uncommon | €0.26 |
| OrnithopterTenth Edition · 336★ | Tenth Edition | 336★ | Uncommon | €0.31 |
| OrnithopterFourth Edition · 341 | Fourth Edition | 341 | Uncommon | $0.37 |
| OrnithopterClassic Sixth Edition · 304 | Classic Sixth Edition | 304 | Uncommon | €0.26 |
| OrnithopterFifth Edition · 393 | Fifth Edition | 393 | Uncommon | $0.43 |
| OrnithopterNinth Edition · 305 | Ninth Edition | 305 | Uncommon | €0.25 |
| OrnithopterNinth Edition · 305★ | Ninth Edition | 305★ | Uncommon | $0.68 |
| OrnithopterAether Revolt · 167 | Aether Revolt | 167 | Uncommon | €0.23 |
| OrnithopterThe Brothers' War Retro Artifacts · 37 | The Brothers' War Retro Artifacts | 37 | Uncommon | €0.20 |
| OrnithopterThe Brothers' War Retro Artifacts · 100 | The Brothers' War Retro Artifacts | 100 | Uncommon | €0.42 |
| OrnithopterThe Brothers' War Retro Artifacts · 100z | The Brothers' War Retro Artifacts | 100z | Uncommon | €285.53 |
| OrnithopterForeign Black Border · 270 | Foreign Black Border | 270 | Uncommon | €1.65 |
| OrnithopterMagic 2011 · 211 | Magic 2011 | 211 | Uncommon | €0.34 |
| OrnithopterMagic 2010 · 216 | Magic 2010 | 216 | Uncommon | €0.26 |
| OrnithopterMirrodin · 224 | Mirrodin | 224 | Uncommon | €0.37 |
| OrnithopterSalvat 2011 · 197 | Salvat 2011 | 197 | Uncommon | €1.41 |
| OrnithopterSummer Magic / Edgar · 270 | Summer Magic / Edgar | 270 | Uncommon | $500.00 |
| OrnithopterWorld Championship Decks 2004 Tokens · ap224 | World Championship Decks 2004 Tokens | ap224 | Uncommon | €0.20 |
| OrnithopterHistoric Anthology 1 · 18 | Historic Anthology 1 | 18 | Uncommon | — |
| OrnithopterKaladesh Remastered · 255 | Kaladesh Remastered | 255 | Uncommon | — |
| Orochi Eggwatcher // Shidako, BroodmistressChampions of Kamigawa · 233 | Champions of Kamigawa | 233 | Uncommon | €0.11 |
| Orochi Eggwatcher // Shidako, BroodmistressThe List Tokens · CHK-233 | The List Tokens | CHK-233 | Uncommon | $0.11 |
| Orochi Merge-KeeperFoundations Jumpstart · 695 | Foundations Jumpstart | 695 | Uncommon | €0.14 |
| Orochi Merge-KeeperKamigawa: Neon Dynasty · 203 | Kamigawa: Neon Dynasty | 203 | Uncommon | €0.12 |
| Orphans of the WheatDuskmourn: House of Horror · 22 | Duskmourn: House of Horror | 22 | Uncommon | €0.05 |
| Orysa, Tide ChoreographerSecrets of Strixhaven · 62 | Secrets of Strixhaven | 62 | Uncommon | €0.07 |
| Orzhov AdvokistCommander 2016 · 3 | Commander 2016 | 3 | Uncommon | $0.19 |
| Orzhov AdvokistCommander 2021 · 99 | Commander 2021 | 99 | Uncommon | €0.12 |
| Orzhov AdvokistCommander Anthology Volume II · 34 | Commander Anthology Volume II | 34 | Uncommon | €0.29 |
| Orzhov AdvokistCommander Legends · 35 | Commander Legends | 35 | Uncommon | €0.17 |
| Orzhov AdvokistMidnight Hunt Commander · 91 | Midnight Hunt Commander | 91 | Uncommon | €0.12 |
| Orzhov AdvokistMurders at Karlov Manor Commander · 77 | Murders at Karlov Manor Commander | 77 | Uncommon | €0.17 |
| Orzhov AdvokistNew Capenna Commander · 207 | New Capenna Commander | 207 | Uncommon | €0.13 |
| Orzhov AdvokistThe List Tokens · C16-3 | The List Tokens | C16-3 | Uncommon | €0.10 |
| Orzhov AdvokistTreasure Chest · 3 | Treasure Chest | 3 | Uncommon | — |
| Orzhova, the Church of DealsGuildpact · 162 | Guildpact | 162 | Uncommon | €0.10 |
| Orzhova, the Church of DealsThe List Tokens · GPT-162 | The List Tokens | GPT-162 | Uncommon | €0.18 |
| Orzhov BasilicaDouble Masters 2022 · 327 | Double Masters 2022 | 327 | Uncommon | €0.22 |
| Orzhov BasilicaDouble Masters 2022 · 409 | Double Masters 2022 | 409 | Uncommon | €1.20 |
| Orzhov BasilicaForgotten Realms Commander · 253 | Forgotten Realms Commander | 253 | Uncommon | €0.22 |
| Orzhov BasilicaThe Brothers' War Commander · 191 | The Brothers' War Commander | 191 | Uncommon | €0.19 |
| Orzhov BasilicaCommander 2016 · 314 | Commander 2016 | 314 | Uncommon | €0.16 |
| Orzhov BasilicaCommander 2018 · 271 | Commander 2018 | 271 | Uncommon | €0.24 |