| OublietteDouble Masters · 100 | Double Masters | 100 | Uncommon | €2.07 |
| OublietteThe List Tokens · 2XM-100 | The List Tokens | 2XM-100 | Uncommon | $1.58 |
| Ouphe VandalsFifth Dawn · 90 | Fifth Dawn | 90 | Uncommon | €0.07 |
| OustRavnica: Clue Edition · 67 | Ravnica: Clue Edition | 67 | Uncommon | $0.26 |
| OustDuel Decks: Zendikar vs. Eldrazi Tokens · 7 | Duel Decks: Zendikar vs. Eldrazi Tokens | 7 | Uncommon | $0.28 |
| OustThe List Tokens · DDP-7 | The List Tokens | DDP-7 | Uncommon | $0.19 |
| OustRise of the Eldrazi · 40 | Rise of the Eldrazi | 40 | Uncommon | $0.32 |
| OustArena Anthology 2 · 2 | Arena Anthology 2 | 2 | Uncommon | — |
| OutbreakProphecy · 71 | Prophecy | 71 | Uncommon | $0.17 |
| Outcaster GreenbladeOutlaws of Thunder Junction · 172 | Outlaws of Thunder Junction | 172 | Uncommon | €0.06 |
| Outland BoarAether Revolt · 132 | Aether Revolt | 132 | Uncommon | €0.06 |
| Outland BoarKaladesh Remastered · 201 | Kaladesh Remastered | 201 | Uncommon | — |
| Outland Liberator // Frenzied TrapbreakerInnistrad: Double Feature · 190 | Innistrad: Double Feature | 190 | Uncommon | €0.62 |
| Outland Liberator // Frenzied TrapbreakerInnistrad: Midnight Hunt · 190 | Innistrad: Midnight Hunt | 190 | Uncommon | €0.27 |
| Outland Liberator // Frenzied TrapbreakerInnistrad: Midnight Hunt · 303 | Innistrad: Midnight Hunt | 303 | Uncommon | $0.33 |
| Outlaw StitcherOutlaws of Thunder Junction · 59 | Outlaws of Thunder Junction | 59 | Uncommon | €0.02 |
| OutmaneuverThe List Tokens · USG-205 | The List Tokens | USG-205 | Uncommon | €0.22 |
| OutmaneuverUrza's Saga · 205 | Urza's Saga | 205 | Uncommon | €0.39 |
| Out of BoundsBattlebond · 38 | Battlebond | 38 | Uncommon | $0.19 |
| Out of BoundsThe List Tokens · BBD-38 | The List Tokens | BBD-38 | Uncommon | — |
| Out of the WayStreets of New Capenna · 52 | Streets of New Capenna | 52 | Uncommon | €0.08 |
| Out of TownUnknown Event · UW11a | Unknown Event | UW11a | Uncommon | $40.00 |
| Outpace OblivionAetherdrift · 139 | Aetherdrift | 139 | Uncommon | €0.12 |
| Outrage ShamanEventide · 59 | Eventide | 59 | Uncommon | $0.11 |
| Outrider en-KorTime Spiral · 31 | Time Spiral | 31 | Uncommon | €0.18 |
| Outrider en-KorTime Spiral Remastered · 30 | Time Spiral Remastered | 30 | Uncommon | €0.17 |
| Ovalchase DaredevilDouble Masters · 101 | Double Masters | 101 | Uncommon | €0.18 |
| Ovalchase DaredevilKaladesh · 97 | Kaladesh | 97 | Uncommon | €0.09 |
| Ovalchase DaredevilPioneer Masters · 337 | Pioneer Masters | 337 | Uncommon | — |
| Ovalchase DragsterKaladesh · 225 | Kaladesh | 225 | Uncommon | €0.11 |
| Ovalchase DragsterKaladesh Remastered · 256 | Kaladesh Remastered | 256 | Uncommon | — |
| OverblazeBetrayers of Kamigawa · 114 | Betrayers of Kamigawa | 114 | Uncommon | €0.21 |
| OvercomeRavnica: Clue Edition · 171 | Ravnica: Clue Edition | 171 | Uncommon | $0.14 |
| OvercomeGame Night · 48 | Game Night | 48 | Uncommon | €0.19 |
| OvercomeHour of Devastation · 125 | Hour of Devastation | 125 | Uncommon | €0.05 |
| OvercomeFoundations Jumpstart · 696 | Foundations Jumpstart | 696 | Uncommon | €0.10 |
| OvercomeJumpstart 2022 · 701 | Jumpstart 2022 | 701 | Uncommon | €0.11 |
| OvercomeCore Set 2020 · 186 | Core Set 2020 | 186 | Uncommon | €0.05 |
| OvercomeThe List Tokens · M20-186 | The List Tokens | M20-186 | Uncommon | $0.11 |
| Overgrown ArchStrixhaven: School of Mages · 139 | Strixhaven: School of Mages | 139 | Uncommon | €0.16 |
| Overgrown BattlementIconic Masters · 180 | Iconic Masters | 180 | Uncommon | $0.29 |
| Overgrown BattlementJumpstart · 417 | Jumpstart | 417 | Uncommon | $0.27 |
| Overgrown BattlementNew Capenna Commander · 303 | New Capenna Commander | 303 | Uncommon | €0.31 |
| Overgrown BattlementThe List Tokens · IMA-180 | The List Tokens | IMA-180 | Uncommon | $0.38 |
| Overgrown BattlementTarkir: Dragonstorm Commander · 264 | Tarkir: Dragonstorm Commander | 264 | Uncommon | $0.38 |
| Overgrown ZealotDuskmourn: House of Horror · 193 | Duskmourn: House of Horror | 193 | Uncommon | €0.13 |
| Overgrowth ElementalCore Set 2020 · 187 | Core Set 2020 | 187 | Uncommon | €0.14 |
| OverkillFinal Fantasy · 109 | Final Fantasy | 109 | Uncommon | €0.14 |
| Overpowering AttackAssassin's Creed · 37 | Assassin's Creed | 37 | Uncommon | $1.32 |
| Overpowering AttackAssassin's Creed · 218 | Assassin's Creed | 218 | Uncommon | €2.89 |