| Obscura CharmStreets of New Capenna · 388 | Streets of New Capenna | 388 | Uncommon | €0.02 |
| Obsessive AstronomerInnistrad: Double Feature · 152 | Innistrad: Double Feature | 152 | Uncommon | €0.05 |
| Obsessive AstronomerInnistrad: Midnight Hunt · 152 | Innistrad: Midnight Hunt | 152 | Uncommon | €0.07 |
| Obsessive SkinnerDuskmourn: House of Horror Commander · 191 | Duskmourn: House of Horror Commander | 191 | Uncommon | €0.13 |
| Obsessive SkinnerShadows over Innistrad · 220 | Shadows over Innistrad | 220 | Uncommon | €0.17 |
| Obsessive StitcherForgotten Realms Commander · 189 | Forgotten Realms Commander | 189 | Uncommon | €0.21 |
| Obsessive StitcherCore Set 2021 · 223 | Core Set 2021 | 223 | Uncommon | €0.15 |
| Obsessive StitcherThe List Tokens · M21-223 | The List Tokens | M21-223 | Uncommon | €0.25 |
| Obsianus GolemUnlimited Edition · 268 | Unlimited Edition | 268 | Uncommon | €2.17 |
| Obsianus GolemRevised Edition · 268 | Revised Edition | 268 | Uncommon | $0.20 |
| Obsianus Golem30th Anniversary Edition · 264 | 30th Anniversary Edition | 264 | Uncommon | €1.02 |
| Obsianus Golem30th Anniversary Edition · 561 | 30th Anniversary Edition | 561 | Uncommon | €10.00 |
| Obsianus GolemFourth Edition Foreign Black Border · 339 | Fourth Edition Foreign Black Border | 339 | Uncommon | €0.78 |
| Obsianus GolemFourth Edition · 339 | Fourth Edition | 339 | Uncommon | €0.17 |
| Obsianus GolemClassic Sixth Edition · 303 | Classic Sixth Edition | 303 | Uncommon | €0.05 |
| Obsianus GolemCollectors' Edition · 268 | Collectors' Edition | 268 | Uncommon | €1.21 |
| Obsianus GolemIntl. Collectors' Edition · 268 | Intl. Collectors' Edition | 268 | Uncommon | €1.07 |
| Obsianus GolemForeign Black Border · 268 | Foreign Black Border | 268 | Uncommon | €0.51 |
| Obsianus GolemLimited Edition Alpha · 267 | Limited Edition Alpha | 267 | Uncommon | €39.67 |
| Obsianus GolemLimited Edition Beta · 268 | Limited Edition Beta | 268 | Uncommon | €13.62 |
| Obsianus GolemSummer Magic / Edgar · 268 | Summer Magic / Edgar | 268 | Uncommon | €235.81 |
| Obsidian Battle-AxeMorningtide · 144 | Morningtide | 144 | Uncommon | €0.25 |
| Obsidian Battle-AxeSalvat 2011 · 196 | Salvat 2011 | 196 | Uncommon | €0.19 |
| Obsidian GiantPortal Second Age · 109 | Portal Second Age | 109 | Uncommon | €0.21 |
| Obstinate BalothThe Brothers' War · 187 | The Brothers' War | 187 | Uncommon | €0.09 |
| Obstinate BalothFoundations Jumpstart · 692 | Foundations Jumpstart | 692 | Uncommon | €0.17 |
| Obyra, Dreaming DuelistWilds of Eldraine · 210 | Wilds of Eldraine | 210 | Uncommon | €0.20 |
| Ochran AssassinGuilds of Ravnica · 194 | Guilds of Ravnica | 194 | Uncommon | €0.21 |
| Ochran AssassinThe List Tokens · GRN-194 | The List Tokens | GRN-194 | Uncommon | €0.28 |
| Octo OpusUnfinity · 54 | Unfinity | 54 | Uncommon | $0.06 |
| Octo OpusUnfinity · 340 | Unfinity | 340 | Uncommon | $0.42 |
| Odric's OutriderInnistrad: Double Feature · 29 | Innistrad: Double Feature | 29 | Uncommon | €0.12 |
| Odric's OutriderInnistrad: Midnight Hunt · 29 | Innistrad: Midnight Hunt | 29 | Uncommon | €0.12 |
| Odunos River TrawlerBorn of the Gods · 79 | Born of the Gods | 79 | Uncommon | €0.12 |
| Odylic WraithWeatherlight · 77 | Weatherlight | 77 | Uncommon | $0.30 |
| OffalsnoutMorningtide · 71 | Morningtide | 71 | Uncommon | €0.13 |
| Ogre ArsonistPortal Second Age · 110 | Portal Second Age | 110 | Uncommon | $0.25 |
| Ogre ArsonistThe List Tokens · P02-110 | The List Tokens | P02-110 | Uncommon | €0.07 |
| Ogre GeargrabberScars of Mirrodin · 99 | Scars of Mirrodin | 99 | Uncommon | $0.06 |
| Ogre MarauderBetrayers of Kamigawa · 75 | Betrayers of Kamigawa | 75 | Uncommon | €0.19 |
| Ogre RecluseBetrayers of Kamigawa · 113 | Betrayers of Kamigawa | 113 | Uncommon | $0.07 |
| Ogre's CleaverRise of the Eldrazi · 220 | Rise of the Eldrazi | 220 | Uncommon | $0.25 |
| Ogre SiegebreakerCore Set 2020 · 215 | Core Set 2020 | 215 | Uncommon | €0.08 |
| Ogre TaskmasterSeventh Edition · 203 | Seventh Edition | 203 | Uncommon | €0.14 |
| Ogre TaskmasterSeventh Edition · 203★ | Seventh Edition | 203★ | Uncommon | $0.16 |
| Ogre TaskmasterEighth Edition · 205 | Eighth Edition | 205 | Uncommon | €0.02 |
| Ogre TaskmasterEighth Edition · 205★ | Eighth Edition | 205★ | Uncommon | $0.09 |
| Ogre TaskmasterNinth Edition · 205 | Ninth Edition | 205 | Uncommon | €0.09 |
| Ogre TaskmasterNinth Edition · 205★ | Ninth Edition | 205★ | Uncommon | $0.09 |
| Ogre TaskmasterMercadian Masques · 206 | Mercadian Masques | 206 | Uncommon | €0.12 |