| Origin of the Hidden OnesAssassin's Creed · 36 | Assassin's Creed | 36 | Uncommon | €0.11 |
| Origin of the HulkMarvel Super Heroes Commander · 728 | Marvel Super Heroes Commander | 728 | Uncommon | €0.17 |
| Origin of ThorMarvel Super Heroes Commander · 701 | Marvel Super Heroes Commander | 701 | Uncommon | €0.26 |
| Origin SpellbombScars of Mirrodin · 189 | Scars of Mirrodin | 189 | Common | €0.13 |
| Ori, Keeper of SongsThe Hobbit · 23 | The Hobbit | 23 | Common | €0.03 |
| OrimVanguard Series · 205 | Vanguard Series | 205 | Rare | €8.41 |
| Orim, Samite HealerTempest · 33 | Tempest | 33 | Rare | €1.74 |
| Orim, Samite HealerTempest Remastered · 21 | Tempest Remastered | 21 | Rare | — |
| Orim's ChantJudge Gift Cards 2008 · 1 | Judge Gift Cards 2008 | 1 | Rare | €98.16 |
| Orim's ChantModern Horizons 3 · 265 | Modern Horizons 3 | 265 | Rare | $5.82 |
| Orim's ChantModern Horizons 3 · 323 | Modern Horizons 3 | 323 | Rare | $10.56 |
| Orim's ChantPlaneshift · 11 | Planeshift | 11 | Rare | €17.16 |
| Orim's ChantThe List Tokens · PLS-11 | The List Tokens | PLS-11 | Rare | $7.55 |
| Orim's ChantSecret Lair Drop Tokens · 2669 | Secret Lair Drop Tokens | 2669 | Rare | $9.85 |
| Orim's ChantMagic Online Promos · 35072 | Magic Online Promos | 35072 | Rare | — |
| Orim's CureMercadian Masques · 33 | Mercadian Masques | 33 | Common | €0.17 |
| Orim's PrayerTempest · 32 | Tempest | 32 | Uncommon | €0.50 |
| Orim's ThunderApocalypse · 15 | Apocalypse | 15 | Common | €0.14 |
| Orim's ThunderCommander 2015 · 78 | Commander 2015 | 78 | Common | €0.15 |
| Orim's ThunderCommander Anthology Volume II · 33 | Commander Anthology Volume II | 33 | Common | €0.13 |
| Orim's ThunderCommander Anthology · 18 | Commander Anthology | 18 | Common | €0.14 |
| Orim's ThunderCommander 2011 · 24 | Commander 2011 | 24 | Common | $0.07 |
| Orim's ThunderDominaria Remastered · 18 | Dominaria Remastered | 18 | Common | €0.03 |
| Orim's ThunderPlanechase · 5 | Planechase | 5 | Common | €0.13 |
| Orim's TouchInvasion · 23 | Invasion | 23 | Common | $0.06 |
| Ori, Plate StackerThe Hobbit Eternal · 6 | The Hobbit Eternal | 6 | Rare | $3.98 |
| Oriq LoremageStrixhaven: School of Mages Promos · 80p | Strixhaven: School of Mages Promos | 80p | Rare | €0.62 |
| Oriq LoremageStrixhaven: School of Mages Promos · 80s | Strixhaven: School of Mages Promos | 80s | Rare | €0.44 |
| Oriq LoremageStrixhaven: School of Mages · 80 | Strixhaven: School of Mages | 80 | Rare | $0.52 |
| Oriq LoremageStrixhaven: School of Mages · 304 | Strixhaven: School of Mages | 304 | Rare | €0.80 |
| Oriq LoremageMagic Online Promos · 90052 | Magic Online Promos | 90052 | Rare | — |
| Oriq Loremage // Oriq LoremageStrixhaven Art Series · 10 | Strixhaven Art Series | 10 | — | — |
| Oriq Loremage // Oriq LoremageStrixhaven Art Series · 10s | Strixhaven Art Series | 10s | — | — |
| Oriss, Samite GuardianFuture Sight · 28 | Future Sight | 28 | Rare | €0.51 |
| Ormacar, Relic Wraith2023 Heroes of the Realm · 2 | 2023 Heroes of the Realm | 2 | Mythic Rare | — |
| Ormendahl, the Corrupter // Ormendahl, the CorrupterMidnight Hunt Art Series · 38 | Midnight Hunt Art Series | 38 | — | — |
| Ormos, Archive KeeperJumpstart · 13 | Jumpstart | 13 | Rare | €0.28 |
| Ormos, Archive KeeperThe List Tokens · JMP-13 | The List Tokens | JMP-13 | Rare | €0.45 |
| Ornamental CourageKaladesh · 164 | Kaladesh | 164 | Common | €0.05 |
| Ornamental CourageKaladesh Remastered · 173 | Kaladesh Remastered | 173 | Common | — |
| Ornate ImitationsAlchemy: Aetherdrift · 23 | Alchemy: Aetherdrift | 23 | Mythic Rare | — |
| Ornate KanzashiBetrayers of Kamigawa · 157 | Betrayers of Kamigawa | 157 | Rare | €0.25 |
| Ornery DilophosaurJumpstart 2022 · 700 | Jumpstart 2022 | 700 | Common | €0.13 |
| Ornery DilophosaurCore Set 2021 · 194 | Core Set 2021 | 194 | Common | €0.06 |
| Ornery GoblinRavnica: Clue Edition · 143 | Ravnica: Clue Edition | 143 | Common | $0.14 |
| Ornery GoblinGuilds of Ravnica · 112 | Guilds of Ravnica | 112 | Common | €0.05 |
| Ornery GoblinJumpstart · 353 | Jumpstart | 353 | Common | €0.09 |
| Ornery KuduAmonkhet · 178 | Amonkhet | 178 | Common | €0.06 |
| Ornery KuduAmonkhet Remastered · 206 | Amonkhet Remastered | 206 | Common | — |
| Ornery TumblewaggOutlaws of Thunder Junction · 171 | Outlaws of Thunder Junction | 171 | Rare | €0.33 |