| Oni PossessionDuel Decks: Divine vs. Demonic · 51 | Duel Decks: Divine vs. Demonic | 51 | Uncommon | €0.07 |
| Oni PossessionDuel Decks Anthology: Divine vs. Demonic · 51 | Duel Decks Anthology: Divine vs. Demonic | 51 | Uncommon | €0.15 |
| Only Blood Ends Your NightmaresArchenemy Schemes · 34★ | Archenemy Schemes | 34★ | Common | €0.65 |
| Only I Know What AwaitsDuskmourn: House of Horror Commander · 350 | Duskmourn: House of Horror Commander | 350 | Common | $0.28 |
| On Serra's WingsCommander Legends · 380 | Commander Legends | 380 | Uncommon | €0.05 |
| On Serra's WingsDominaria · 28 | Dominaria | 28 | Uncommon | $0.18 |
| On Serra's WingsThe List Tokens · DOM-28 | The List Tokens | DOM-28 | Uncommon | €0.17 |
| OnslaughtExodus · 92 | Exodus | 92 | Common | $0.16 |
| 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 |
| On the TrailMurders at Karlov Manor Commander · 39 | Murders at Karlov Manor Commander | 39 | Rare | €1.00 |
| On the TrailMurders at Karlov Manor Commander · 349 | Murders at Karlov Manor Commander | 349 | Rare | €2.72 |
| On Thin IceModern Horizons · 20 | Modern Horizons | 20 | Rare | $0.64 |
| OnuletRevised Edition · 269 | Revised Edition | 269 | Rare | $0.52 |
| OnuletFourth Edition Foreign Black Border · 340 | Fourth Edition Foreign Black Border | 340 | Rare | €3.38 |
| OnuletFourth Edition · 340 | Fourth Edition | 340 | Rare | $0.31 |
| OnuletAntiquities · 59 | Antiquities | 59 | Uncommon | $2.00 |
| OnuletForeign Black Border · 269 | Foreign Black Border | 269 | Rare | €1.96 |
| OnuletSummer Magic / Edgar · 269 | Summer Magic / Edgar | 269 | Rare | €375.00 |
| OnuletMasters Edition · 161 | Masters Edition | 161 | Common | — |
| OnuletMasters Edition IV · 219 | Masters Edition IV | 219 | Common | — |
| Onward // VictoryAmonkhet · 218 | Amonkhet | 218 | Uncommon | €0.07 |
| Onward // VictoryAmonkhet Remastered · 250 | Amonkhet Remastered | 250 | Uncommon | — |
| On Wings of GoldAetherdrift Commander · 5 | Aetherdrift Commander | 5 | Rare | $0.46 |
| On Wings of GoldAetherdrift Commander · 21 | Aetherdrift Commander | 21 | Rare | €0.02 |
| Onyx GobletShards of Alara · 81 | Shards of Alara | 81 | Common | €0.09 |
| Onyx GobletSalvat 2011 · 79 | Salvat 2011 | 79 | Common | €0.06 |
| Onyx MageMagic 2012 · 103 | Magic 2012 | 103 | Uncommon | €0.16 |
| Onyx TalismanIce Age · 331 | Ice Age | 331 | Uncommon | €0.29 |
| Ood SphereDoctor Who · 594 | Doctor Who | 594 | Common | €0.27 |
| Oona, Queen of the FaeModern Masters · 193 | Modern Masters | 193 | Rare | €0.81 |
| Oona, Queen of the FaeSecret Lair Drop Tokens · 54 | Secret Lair Drop Tokens | 54 | Mythic Rare | €10.79 |
| Oona, Queen of the FaeShadowmoor · 172 | Shadowmoor | 172 | Rare | €0.74 |
| Oona, Queen of the FaeFrom the Vault: Legends · 8 | From the Vault: Legends | 8 | Mythic Rare | €1.48 |
| Oona, Queen of the FaeWilds of Eldraine Commander · 142 | Wilds of Eldraine Commander | 142 | Rare | €0.42 |
| Oona, Queen of the FaeZendikar Rising Commander · 98 | Zendikar Rising Commander | 98 | Rare | €0.15 |
| Oona's BlackguardDCI Promos · 15 | DCI Promos | 15 | Rare | €1.43 |
| Oona's BlackguardJumpstart · 261 | Jumpstart | 261 | Uncommon | €0.38 |
| Oona's BlackguardMorningtide · 72 | Morningtide | 72 | Uncommon | €0.43 |
| Oona's BlackguardZendikar Rising Commander · 51 | Zendikar Rising Commander | 51 | Uncommon | $0.33 |
| Oona's BlackguardMagic Online Promos · 32535 | Magic Online Promos | 32535 | Uncommon | — |
| Oona's GatewardenShadowmoor · 173 | Shadowmoor | 173 | Common | $0.25 |
| Oona's GraceCommander 2019 · 91 | Commander 2019 | 91 | Common | $0.14 |
| Oona's GraceEternal Masters · 63 | Eternal Masters | 63 | Common | €0.14 |
| Oona's GraceEventide · 27 | Eventide | 27 | Common | $0.19 |
| Oona's ProwlerDouble Masters 2022 · 85 | Double Masters 2022 | 85 | Rare | €0.23 |
| Oona's ProwlerDouble Masters 2022 · 443 | Double Masters 2022 | 443 | Rare | €0.38 |
| Oona's ProwlerLorwyn · 133 | Lorwyn | 133 | Rare | €0.53 |
| OozeDouble Masters Tokens · 15 | Double Masters Tokens | 15 | — | €0.21 |