| OkkSeventh Edition · 204★ | Seventh Edition | 204★ | Rare | $0.33 |
| OkkEighth Edition · 206 | Eighth Edition | 206 | Rare | €0.19 |
| OkkEighth Edition · 206★ | Eighth Edition | 206★ | Rare | $0.36 |
| OkkUrza's Saga · 204 | Urza's Saga | 204 | Rare | $0.43 |
| Oko's HospitalityThrone of Eldraine · 312 | Throne of Eldraine | 312 | Rare | €0.10 |
| Okoye, Mighty and AdoredMarvel Super Heroes Commander · 89 | Marvel Super Heroes Commander | 89 | Rare | $0.27 |
| Okoye, Mighty and AdoredMarvel Super Heroes Commander · 410 | Marvel Super Heroes Commander | 410 | Rare | $1.38 |
| Old FogeyThe List (Unfinity Foil Edition) · 39 | The List (Unfinity Foil Edition) | 39 | Rare | $0.65 |
| Old FogeyUnsanctioned · 67 | Unsanctioned | 67 | Rare | €0.19 |
| Old FogeyUnhinged · 106 | Unhinged | 106 | Rare | $0.78 |
| Old FogeyUnhinged · 106★ | Unhinged | 106★ | Rare | €0.66 |
| Old-Growth DryadsIxalan Promos · 199s | Ixalan Promos | 199s | Rare | €0.61 |
| Old-Growth DryadsIxalan · 199 | Ixalan | 199 | Rare | €0.16 |
| Old-Growth TrollKaldheim · 185 | Kaldheim | 185 | Rare | $0.32 |
| Old-Growth TrollKaldheim · 365 | Kaldheim | 365 | Rare | $0.50 |
| Old-Growth TrollKaldheim Promos · 185p | Kaldheim Promos | 185p | Rare | €0.73 |
| Old-Growth TrollKaldheim Promos · 185s | Kaldheim Promos | 185s | Rare | $0.47 |
| Old-Growth TrollMagic Online Promos · 88338 | Magic Online Promos | 88338 | Rare | — |
| Old Man of the SeaArabian Nights · 18 | Arabian Nights | 18 | Rare | €206.24 |
| Old Man of the SeaMasters Edition III · 45 | Masters Edition III | 45 | Rare | — |
| Old Man of the SeaMagic Online Promos · 43644 | Magic Online Promos | 43644 | Rare | — |
| Old One EyeWarhammer 40,000 Commander · 96 | Warhammer 40,000 Commander | 96 | Rare | €2.12 |
| Old One EyeWarhammer 40,000 Commander · 96★ | Warhammer 40,000 Commander | 96★ | Rare | $9.05 |
| Old RutsteinInnistrad: Double Feature · 511 | Innistrad: Double Feature | 511 | Rare | €0.86 |
| Old RutsteinInnistrad: Crimson Vow Promos · 244s | Innistrad: Crimson Vow Promos | 244s | Rare | €1.18 |
| Old RutsteinInnistrad: Crimson Vow · 244 | Innistrad: Crimson Vow | 244 | Rare | $0.59 |
| Old RutsteinInnistrad: Crimson Vow · 326 | Innistrad: Crimson Vow | 326 | Rare | $0.43 |
| Old StickfingersInnistrad: Double Feature · 234 | Innistrad: Double Feature | 234 | Rare | €0.44 |
| Old StickfingersDuskmourn: House of Horror Commander · 227 | Duskmourn: House of Horror Commander | 227 | Rare | €0.33 |
| Old StickfingersInnistrad: Midnight Hunt · 234 | Innistrad: Midnight Hunt | 234 | Rare | €0.34 |
| Old StickfingersInnistrad: Midnight Hunt · 321 | Innistrad: Midnight Hunt | 321 | Rare | $0.34 |
| Old StickfingersInnistrad: Midnight Hunt Promos · 234p | Innistrad: Midnight Hunt Promos | 234p | Rare | €0.27 |
| Old StickfingersInnistrad: Midnight Hunt Promos · 234s | Innistrad: Midnight Hunt Promos | 234s | Rare | €1.21 |
| Old Way PhyrexianUnknown Event · RB03d | Unknown Event | RB03d | Rare | — |
| Olivia's AttendantsInnistrad: Double Feature · 439 | Innistrad: Double Feature | 439 | Rare | €0.37 |
| Olivia's AttendantsInnistrad: Crimson Vow Promos · 172s | Innistrad: Crimson Vow Promos | 172s | Rare | €0.88 |
| Olivia's AttendantsInnistrad: Crimson Vow · 172 | Innistrad: Crimson Vow | 172 | Rare | €0.28 |
| Olivia's AttendantsInnistrad: Crimson Vow · 307 | Innistrad: Crimson Vow | 307 | Rare | €0.37 |
| Olivia's WrathThe Lost Caverns of Ixalan Commander · 205 | The Lost Caverns of Ixalan Commander | 205 | Rare | $0.47 |
| Olivia's WrathCrimson Vow Commander · 20 | Crimson Vow Commander | 20 | Rare | $0.54 |
| Olivia's WrathCrimson Vow Commander · 58 | Crimson Vow Commander | 58 | Rare | €0.58 |
| Olórin's Searing LightTales of Middle-earth Commander · 503 | Tales of Middle-earth Commander | 503 | Rare | $5.76 |
| Olórin's Searing LightTales of Middle-earth Commander · 547 | Tales of Middle-earth Commander | 547 | Rare | $16.12 |
| Oloro, Ageless AsceticJudge Gift Cards 2014 · 9 | Judge Gift Cards 2014 | 9 | Rare | €35.09 |
| Omen MachineNew Phyrexia · 148 | New Phyrexia | 148 | Rare | €0.82 |
| Omen of FireAlliances · 75 | Alliances | 75 | Rare | €1.29 |
| Omenpath to NayaMystery Booster 2 Tokens · 616 | Mystery Booster 2 Tokens | 616 | Rare | $0.19 |
| Ominous HarvestSecrets of Strixhaven Commander · 28 | Secrets of Strixhaven Commander | 28 | Rare | $0.33 |
| Ominous HarvestSecrets of Strixhaven Commander · 77 | Secrets of Strixhaven Commander | 77 | Rare | $0.70 |
| Ominous LockboxAlchemy: Murders at Karlov Manor · 8 | Alchemy: Murders at Karlov Manor | 8 | Rare | — |