| Olag and Miau, New FriendsMystery Booster Commander Edition · 48 | Mystery Booster Commander Edition | 48 | Rare | €8.66 |
| Ol' BuzzbarkThe List (Unfinity Foil Edition) · 51 | The List (Unfinity Foil Edition) | 51 | Mythic Rare | $0.36 |
| Ol' BuzzbarkUnstable · 134 | Unstable | 134 | Mythic Rare | $0.38 |
| Old-Fashioned VampireUnstable · 62 | Unstable | 62 | Uncommon | €0.12 |
| Old Fat SpiderThe Hobbit · 132 | The Hobbit | 132 | Uncommon | $0.10 |
| Old Fat Spider Can't See MeThe Hobbit · 50 | The Hobbit | 50 | Uncommon | €0.08 |
| Old FlitterfangWilds of Eldraine · 316 | Wilds of Eldraine | 316 | Uncommon | $0.38 |
| Old FogeyThe List (Unfinity Foil Edition) · 39 | The List (Unfinity Foil Edition) | 39 | Rare | $0.64 |
| Old FogeyUnsanctioned · 67 | Unsanctioned | 67 | Rare | €0.19 |
| Old FogeyUnhinged · 106 | Unhinged | 106 | Rare | $0.75 |
| Old FogeyUnhinged · 106★ | Unhinged | 106★ | Rare | €0.66 |
| Old GhastbarkShadowmoor · 232 | Shadowmoor | 232 | Common | €0.05 |
| Old GhastbarkThe List Tokens · SHM-232 | The List Tokens | SHM-232 | Common | €0.10 |
| Old GnawboneAdventures in the Forgotten Realms · 197 | Adventures in the Forgotten Realms | 197 | Mythic Rare | €45.69 |
| Old GnawboneAdventures in the Forgotten Realms · 296 | Adventures in the Forgotten Realms | 296 | Mythic Rare | €59.64 |
| Old GnawboneAdventures in the Forgotten Realms Promos · 197a | Adventures in the Forgotten Realms Promos | 197a | Mythic Rare | €78.17 |
| Old GnawboneAdventures in the Forgotten Realms Promos · 197p | Adventures in the Forgotten Realms Promos | 197p | Mythic Rare | €44.73 |
| Old GnawboneAdventures in the Forgotten Realms Promos · 197s | Adventures in the Forgotten Realms Promos | 197s | Mythic Rare | $55.89 |
| Old GnawboneSecret Lair Drop Tokens · 1016 | Secret Lair Drop Tokens | 1016 | Mythic Rare | €88.52 |
| Old GnawboneThe List Tokens · AFR-197 | The List Tokens | AFR-197 | Mythic Rare | €40.00 |
| Old GnawboneMagic Online Promos · 92758 | Magic Online Promos | 92758 | Mythic Rare | — |
| Old-Growth DryadsIxalan Promos · 199s | Ixalan Promos | 199s | Rare | €0.61 |
| Old-Growth DryadsIxalan · 199 | Ixalan | 199 | Rare | €0.16 |
| Old-Growth EducatorSecrets of Strixhaven · 207 | Secrets of Strixhaven | 207 | Uncommon | €0.05 |
| Old-Growth Educator // Old-Growth EducatorSecrets of Strixhaven Art Series · 20 | Secrets of Strixhaven Art Series | 20 | — | — |
| 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 | €0.69 |
| Old-Growth TrollKaldheim Promos · 185s | Kaldheim Promos | 185s | Rare | $0.47 |
| Old-Growth TrollMagic Online Promos · 88338 | Magic Online Promos | 88338 | Rare | — |
| Old GuardUnsanctioned · 11 | Unsanctioned | 11 | Common | €0.11 |
| Old GuardUnstable · 16 | Unstable | 16 | Common | €0.07 |
| Old Hob, Alleycat BluesTeenage Mutant Ninja Turtles · 99 | Teenage Mutant Ninja Turtles | 99 | Uncommon | €0.03 |
| Old Man of the SeaArabian Nights · 18 | Arabian Nights | 18 | Rare | €198.50 |
| 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 Man WillowThe Lord of the Rings: Tales of Middle-earth · 217 | The Lord of the Rings: Tales of Middle-earth | 217 | Uncommon | €0.11 |
| Old Man WillowThe Lord of the Rings: Tales of Middle-earth · 668 | The Lord of the Rings: Tales of Middle-earth | 668 | Uncommon | €0.28 |
| Old One EyeWarhammer 40,000 Commander · 96 | Warhammer 40,000 Commander | 96 | Rare | €2.19 |
| 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 | €0.83 |
| Old RutsteinInnistrad: Crimson Vow Promos · 244s | Innistrad: Crimson Vow Promos | 244s | Rare | €1.18 |
| Old RutsteinInnistrad: Crimson Vow · 244 | Innistrad: Crimson Vow | 244 | Rare | $0.61 |
| Old RutsteinInnistrad: Crimson Vow · 326 | Innistrad: Crimson Vow | 326 | Rare | $0.44 |
| Old StickfingersInnistrad: Double Feature · 234 | Innistrad: Double Feature | 234 | Rare | €0.49 |
| 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 | €0.37 |
| Old StickfingersInnistrad: Midnight Hunt · 321 | Innistrad: Midnight Hunt | 321 | Rare | $0.34 |
| Old StickfingersInnistrad: Midnight Hunt Promos · 234p | Innistrad: Midnight Hunt Promos | 234p | Rare | €0.26 |
| Old StickfingersInnistrad: Midnight Hunt Promos · 234s | Innistrad: Midnight Hunt Promos | 234s | Rare | €1.21 |