| Otharri, Suns' GloryPhyrexia: All Will Be One Commander · 3 | Phyrexia: All Will Be One Commander | 3 | Mythic Rare | $5.14 |
| Otharri, Suns' GloryPhyrexia: All Will Be One Commander · 39 | Phyrexia: All Will Be One Commander | 39 | Mythic Rare | €6.45 |
| Otharri, Suns' GloryThe List Tokens · ONC-3 | The List Tokens | ONC-3 | Mythic Rare | $3.04 |
| Otharri, Suns' Glory // Otharri, Suns' GloryPhyrexia: All Will Be One Art Series · 52 | Phyrexia: All Will Be One Art Series | 52 | — | — |
| Othelm, Sigardian OutcastUniverses Within · 6 | Universes Within | 6 | Rare | €0.06 |
| Othelm, Sigardian OutcastSecret Lair Drop Tokens · 346 | Secret Lair Drop Tokens | 346 | Rare | $5.85 |
| Otherworld AtlasAvacyn Restored · 219 | Avacyn Restored | 219 | Rare | €1.21 |
| Otherworldly EscortMurders at Karlov Manor Commander · 12 | Murders at Karlov Manor Commander | 12 | Rare | $0.20 |
| Otherworldly EscortMurders at Karlov Manor Commander · 323 | Murders at Karlov Manor Commander | 323 | Rare | €0.19 |
| Otherworldly GazeInnistrad: Double Feature · 67 | Innistrad: Double Feature | 67 | Common | €1.64 |
| Otherworldly GazeDuskmourn: House of Horror Commander · 122 | Duskmourn: House of Horror Commander | 122 | Common | €0.29 |
| Otherworldly GazeInnistrad: Midnight Hunt · 67 | Innistrad: Midnight Hunt | 67 | Common | $0.31 |
| Otherworldly GazeMurders at Karlov Manor Commander · 115 | Murders at Karlov Manor Commander | 115 | Common | $0.34 |
| Otherworldly GazeSecret Lair Drop Tokens · 2069 | Secret Lair Drop Tokens | 2069 | Rare | €4.03 |
| Otherworldly JourneyChampions of Kamigawa · 37 | Champions of Kamigawa | 37 | Uncommon | €0.19 |
| Otherworldly JourneyDuel Decks: Divine vs. Demonic · 16 | Duel Decks: Divine vs. Demonic | 16 | Uncommon | €0.16 |
| Otherworldly JourneyDuel Decks Anthology: Divine vs. Demonic · 16 | Duel Decks Anthology: Divine vs. Demonic | 16 | Uncommon | €0.16 |
| Otherworldly JourneyModern Masters 2015 · 30 | Modern Masters 2015 | 30 | Common | €0.14 |
| Otherworldly JourneyModern Masters · 23 | Modern Masters | 23 | Common | €0.21 |
| Otherworldly JourneyThe List Tokens · DDC-16 | The List Tokens | DDC-16 | Uncommon | $0.17 |
| Otherworldly OutburstEldritch Moon · 138 | Eldritch Moon | 138 | Common | €0.11 |
| Otrimi, the Ever-PlayfulCommander 2020 · 12 | Commander 2020 | 12 | Mythic Rare | €0.72 |
| Otrimi, the Ever-PlayfulCommander 2020 Oversized · 12 | Commander 2020 Oversized | 12 | Mythic Rare | €0.15 |
| OtterBloomburrow Tokens · 25 | Bloomburrow Tokens | 25 | — | $3.00 |
| Otterball AnticsBloomburrow · 63 | Bloomburrow | 63 | Uncommon | €0.17 |
| Otter-PenguinAvatar: The Last Airbender · 67 | Avatar: The Last Airbender | 67 | Common | €0.10 |
| Otter-Penguin // Otter-PenguinAvatar: the Last Airbender Art Series · 4 | Avatar: the Last Airbender Art Series | 4 | — | — |
| OublietteDouble Masters · 100 | Double Masters | 100 | Uncommon | €1.34 |
| OublietteArabian Nights · 31 | Arabian Nights | 31 | Common | €24.18 |
| OublietteArabian Nights · 31† | Arabian Nights | 31† | Common | $23.61 |
| OublietteSecret Lair Drop Tokens · 1794 | Secret Lair Drop Tokens | 1794 | Rare | €3.90 |
| OublietteThe List Tokens · 2XM-100 | The List Tokens | 2XM-100 | Uncommon | $1.26 |
| OublietteMasters Edition · 79 | Masters Edition | 79 | Common | — |
| Ouphe VandalsFifth Dawn · 90 | Fifth Dawn | 90 | Uncommon | €0.08 |
| Oura, the ImitatorAlchemy: Lorwyn Eclipsed · 22 | Alchemy: Lorwyn Eclipsed | 22 | Rare | — |
| Our Market Research Shows That Players Like Really Long Card Names So We Made this Card to Have the Absolute Longest Card Name Ever ElementalUnhinged · 107 | Unhinged | 107 | Common | €0.26 |
| OuroboroidEdge of Eternities · 201 | Edge of Eternities | 201 | Mythic Rare | €33.54 |
| OuroboroidEdge of Eternities · 345 | Edge of Eternities | 345 | Mythic Rare | €41.93 |
| OuroboroidEdge of Eternities Promos · 201p | Edge of Eternities Promos | 201p | Mythic Rare | €29.16 |
| OuroboroidEdge of Eternities Promos · 201s | Edge of Eternities Promos | 201s | Mythic Rare | €41.85 |
| OustRavnica: Clue Edition · 67 | Ravnica: Clue Edition | 67 | Uncommon | $0.28 |
| 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 | $0.33 |
| 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 | €0.09 |
| Outcaster TrailblazerOutlaws of Thunder Junction · 173 | Outlaws of Thunder Junction | 173 | Rare | €1.70 |
| Outcaster TrailblazerOutlaws of Thunder Junction · 343 | Outlaws of Thunder Junction | 343 | Rare | $2.58 |
| Outcaster TrailblazerOutlaws of Thunder Junction Promos · 173p | Outlaws of Thunder Junction Promos | 173p | Rare | $1.44 |