| Ordinary PonyUnstable · 17 | Unstable | 17 | Common | €0.04 |
| Ordruun CommandoRavnica: City of Guilds · 137 | Ravnica: City of Guilds | 137 | Common | €0.05 |
| Ordruun MentorRavnica: Clue Edition · 39 | Ravnica: Clue Edition | 39 | Uncommon | $0.20 |
| Ordruun VeteranGatecrash · 184 | Gatecrash | 184 | Uncommon | €0.06 |
| Oread of Mountain's BlazeTheros Beyond Death · 146 | Theros Beyond Death | 146 | Common | €0.05 |
| Ore GorgerChampions of Kamigawa · 182 | Champions of Kamigawa | 182 | Uncommon | €0.11 |
| Oreplate PangolinEdge of Eternities · 150 | Edge of Eternities | 150 | Common | €0.04 |
| Ore-Rich Stalactite // Cosmium CatalystThe Lost Caverns of Ixalan Commander · 11 | The Lost Caverns of Ixalan Commander | 11 | Rare | €0.27 |
| Ore-Rich Stalactite // Cosmium CatalystThe Lost Caverns of Ixalan Commander · 23 | The Lost Caverns of Ixalan Commander | 23 | Rare | €0.33 |
| Ore-Scale GuardianModern Horizons · 137 | Modern Horizons | 137 | Uncommon | €0.05 |
| Ore-Scale GuardianJumpstart: Historic Horizons · 493 | Jumpstart: Historic Horizons | 493 | Uncommon | — |
| Oreskos ExplorerBattlebond · 100 | Battlebond | 100 | Uncommon | €0.15 |
| Oreskos ExplorerCommander 2015 · 6 | Commander 2015 | 6 | Uncommon | €0.11 |
| Oreskos ExplorerCommander 2017 · 68 | Commander 2017 | 68 | Uncommon | €0.11 |
| Oreskos ExplorerCommander 2021 · 98 | Commander 2021 | 98 | Uncommon | €0.17 |
| Oreskos ExplorerCommander Anthology Volume II · 32 | Commander Anthology Volume II | 32 | Uncommon | €0.18 |
| Oreskos ExplorerCommander Legends · 381 | Commander Legends | 381 | Uncommon | €0.19 |
| Oreskos ExplorerCommander Masters · 832 | Commander Masters | 832 | Uncommon | €0.02 |
| Oreskos ExplorerThe List Tokens · C21-98 | The List Tokens | C21-98 | Uncommon | €0.29 |
| Oreskos ExplorerLegendary Cube Prize Pack · 10 | Legendary Cube Prize Pack | 10 | Uncommon | — |
| Oreskos Sun GuideBorn of the Gods · 22 | Born of the Gods | 22 | Common | €0.11 |
| Oreskos SwiftclawJourney into Nyx · 20 | Journey into Nyx | 20 | Common | €0.07 |
| Oreskos SwiftclawMagic 2015 · 22 | Magic 2015 | 22 | Common | $0.06 |
| Oreskos SwiftclawCore Set 2019 · 31 | Core Set 2019 | 31 | Common | €0.06 |
| Oreskos SwiftclawThe List Tokens · M15-22 | The List Tokens | M15-22 | Common | $0.34 |
| Organ GrinderTorment · 75 | Torment | 75 | Common | €0.09 |
| Organ HarvestUnglued · 35 | Unglued | 35 | Common | $0.33 |
| Organ HoarderInnistrad: Double Feature · 66 | Innistrad: Double Feature | 66 | Common | €0.13 |
| Organ HoarderFoundations Jumpstart · 340 | Foundations Jumpstart | 340 | Common | $0.17 |
| Organ HoarderInnistrad: Midnight Hunt · 66 | Innistrad: Midnight Hunt | 66 | Common | €0.04 |
| Organic ExtinctionEdge of Eternities Commander · 66 | Edge of Eternities Commander | 66 | Rare | $0.34 |
| Organic ExtinctionMurders at Karlov Manor Commander · 76 | Murders at Karlov Manor Commander | 76 | Rare | €0.49 |
| Organic ExtinctionNeon Dynasty Commander · 8 | Neon Dynasty Commander | 8 | Rare | €0.66 |
| Organic ExtinctionNeon Dynasty Commander · 43 | Neon Dynasty Commander | 43 | Rare | €1.58 |
| Organic ExtinctionMagic Online Promos · 97885 | Magic Online Promos | 97885 | Rare | — |
| OrggFifth Edition · 259 | Fifth Edition | 259 | Rare | $0.39 |
| OrggFallen Empires · 63 | Fallen Empires | 63 | Rare | $0.42 |
| OrggPro Tour Collector Set Tokens · et63 | Pro Tour Collector Set Tokens | et63 | Rare | €0.54 |
| OrggTime Spiral Timeshifted · 67 | Time Spiral Timeshifted | 67 | Special | €0.22 |
| Original SkullclampUnknown Event · UA11 | Unknown Event | UA11 | Uncommon | $39.99 |
| Origin of Black WidowMarvel Super Heroes Commander · 664 | Marvel Super Heroes Commander | 664 | Uncommon | €0.22 |
| Origin of Captain AmericaMarvel Super Heroes Commander · 605 | Marvel Super Heroes Commander | 605 | Uncommon | €0.22 |
| Origin of Iron ManMarvel Super Heroes Commander · 633 | Marvel Super Heroes Commander | 633 | Uncommon | €0.20 |
| Origin of MetalbendingAvatar: The Last Airbender · 187 | Avatar: The Last Airbender | 187 | Common | €0.20 |
| Origin of Spider-ManMarvel's Spider-Man Promos · 9s | Marvel's Spider-Man Promos | 9s | Rare | $0.96 |
| Origin of Spider-ManMarvel's Spider-Man · 9 | Marvel's Spider-Man | 9 | Rare | $0.34 |
| Origin of Spider-ManMarvel's Spider-Man · 218 | Marvel's Spider-Man | 218 | Rare | €0.50 |
| Origin of Spider-ManThrough the Omenpaths · 14 | Through the Omenpaths | 14 | Rare | — |
| Origin of the AvengersMarvel Super Heroes · 28 | Marvel Super Heroes | 28 | Rare | €0.17 |
| Origin of the AvengersMarvel Super Heroes · 298 | Marvel Super Heroes | 298 | Rare | €0.38 |