| Obsessive SearchTorment · 43 | Torment | 43 | Common | €0.20 |
| Obsessive SearchVintage Masters · 83 | Vintage Masters | 83 | Common | — |
| Obsessive SkinnerDuskmourn: House of Horror Commander · 191 | Duskmourn: House of Horror Commander | 191 | Uncommon | €0.09 |
| Obsessive SkinnerShadows over Innistrad · 220 | Shadows over Innistrad | 220 | Uncommon | €0.12 |
| Obsessive SkinnerShadows over Innistrad Remastered · 207 | Shadows over Innistrad Remastered | 207 | Common | — |
| Obsessive StitcherForgotten Realms Commander · 189 | Forgotten Realms Commander | 189 | Uncommon | €0.16 |
| Obsessive StitcherCore Set 2021 · 223 | Core Set 2021 | 223 | Uncommon | $0.17 |
| Obsessive StitcherThe List Tokens · M21-223 | The List Tokens | M21-223 | Uncommon | €0.22 |
| Obsianus GolemUnlimited Edition · 268 | Unlimited Edition | 268 | Uncommon | €2.41 |
| Obsianus GolemRevised Edition · 268 | Revised Edition | 268 | Uncommon | €0.19 |
| Obsianus Golem30th Anniversary Edition · 264 | 30th Anniversary Edition | 264 | Uncommon | €1.08 |
| 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 | €0.80 |
| Obsianus GolemFourth Edition · 339 | Fourth Edition | 339 | Uncommon | €0.19 |
| Obsianus GolemClassic Sixth Edition · 303 | Classic Sixth Edition | 303 | Uncommon | €0.07 |
| 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 | €0.55 |
| Obsianus GolemLimited Edition Alpha · 267 | Limited Edition Alpha | 267 | Uncommon | €39.67 |
| Obsianus GolemLimited Edition Beta · 268 | Limited Edition Beta | 268 | Uncommon | €14.04 |
| Obsianus GolemSummer Magic / Edgar · 268 | Summer Magic / Edgar | 268 | Uncommon | €235.81 |
| Obsianus GolemMasters Edition IV · 218 | Masters Edition IV | 218 | Common | — |
| Obsidian AcolyteInvasion · 22 | Invasion | 22 | Common | $0.34 |
| Obsidian Battle-AxeMorningtide · 144 | Morningtide | 144 | Uncommon | €0.23 |
| Obsidian Battle-AxeSalvat 2011 · 196 | Salvat 2011 | 196 | Uncommon | €0.19 |
| Obsidian CharmawModern Horizons 2 · 137 | Modern Horizons 2 | 137 | Rare | €1.44 |
| Obsidian CharmawModern Horizons 2 · 353 | Modern Horizons 2 | 353 | Rare | $2.09 |
| Obsidian CharmawModern Horizons 2 Promos · 137s | Modern Horizons 2 Promos | 137s | Rare | €5.28 |
| Obsidian FireheartArchenemy: Nicol Bolas · 55 | Archenemy: Nicol Bolas | 55 | Mythic Rare | €0.49 |
| Obsidian FireheartZendikar · 140 | Zendikar | 140 | Mythic Rare | $0.80 |
| Obsidian GiantPortal Second Age · 109 | Portal Second Age | 109 | Uncommon | €0.17 |
| Obsidian ObeliskDominaria United Commander · 18 | Dominaria United Commander | 18 | Rare | €0.10 |
| Obsidian ObeliskDominaria United Commander · 94 | Dominaria United Commander | 94 | Rare | €0.70 |
| Obstinate BalothThe Brothers' War · 187 | The Brothers' War | 187 | Uncommon | €0.13 |
| Obstinate BalothIconic Masters · 179 | Iconic Masters | 179 | Rare | €0.11 |
| Obstinate BalothFoundations Jumpstart · 692 | Foundations Jumpstart | 692 | Uncommon | €0.15 |
| Obstinate BalothMagic 2011 · 188 | Magic 2011 | 188 | Rare | $0.37 |
| Obstinate FamiliarOdyssey · 210 | Odyssey | 210 | Rare | €0.54 |
| Obstinate GargoyleModern Horizons 3 · 195 | Modern Horizons 3 | 195 | Common | €0.11 |
| Obuun, Mul Daya AncestorZendikar Rising Commander · 2 | Zendikar Rising Commander | 2 | Mythic Rare | €0.44 |
| Obuun, Mul Daya AncestorZendikar Rising Commander · 8 | Zendikar Rising Commander | 8 | Mythic Rare | €1.03 |
| Obuun, Mul Daya AncestorMagic Online Promos · 83836 | Magic Online Promos | 83836 | Mythic Rare | — |
| Obyra, Dreaming DuelistWilds of Eldraine · 210 | Wilds of Eldraine | 210 | Uncommon | €0.13 |
| Obyra's Attendants // Desperate ParryWilds of Eldraine · 63 | Wilds of Eldraine | 63 | Common | €0.07 |
| Obzedat, Ghost CouncilGatecrash · 182 | Gatecrash | 182 | Mythic Rare | $1.05 |
| Obzedat, Ghost CouncilModern Masters 2017 · 176 | Modern Masters 2017 | 176 | Rare | $0.94 |
| Obzedat, Ghost CouncilExplorer Anthology 3 · 16 | Explorer Anthology 3 | 16 | Mythic Rare | — |
| Obzedat's AidDragon's Maze · 89 | Dragon's Maze | 89 | Rare | $0.28 |
| Occult EpiphanyCrimson Vow Commander · 14 | Crimson Vow Commander | 14 | Rare | €0.70 |
| Occult EpiphanyCrimson Vow Commander · 52 | Crimson Vow Commander | 52 | Rare | $1.06 |