| Omnath, Locus of RageExplorer Anthology 3 · 17 | Explorer Anthology 3 | 17 | Mythic Rare | — |
| Omnath, Locus of the RoilLorwyn Eclipsed Commander · 130 | Lorwyn Eclipsed Commander | 130 | Mythic Rare | $0.40 |
| Omnath, Locus of the RoilCore Set 2020 · 216 | Core Set 2020 | 216 | Mythic Rare | €1.23 |
| Omnath, Locus of the RoilCore Set 2020 Promos · 216p | Core Set 2020 Promos | 216p | Mythic Rare | €6.33 |
| Omnath, Locus of the RoilCore Set 2020 Promos · 216s | Core Set 2020 Promos | 216s | Mythic Rare | €9.03 |
| Omnath, Locus of the VoidReality Fracture Commander · 3 | Reality Fracture Commander | 3 | Rare | €1.24 |
| Omnath, Locus of the VoidReality Fracture Commander · 88 | Reality Fracture Commander | 88 | Rare | €1.75 |
| OmnibianDissension · 119 | Dissension | 119 | Rare | €1.79 |
| OmnibianRNA Guild Kit · 121 | RNA Guild Kit | 121 | Rare | €1.53 |
| Omni-ChangelingLorwyn Eclipsed · 62 | Lorwyn Eclipsed | 62 | Uncommon | €0.23 |
| Omni-ChangelingThe List Tokens · ECL-62 | The List Tokens | ECL-62 | Uncommon | €0.15 |
| Omni-Cheese PizzaTeenage Mutant Ninja Turtles · 176 | Teenage Mutant Ninja Turtles | 176 | Common | €0.04 |
| Omniclown Colossus // Pie-roclasmUnfinity · 116 | Unfinity | 116 | Rare | $0.10 |
| Omniclown Colossus // Pie-roclasmUnfinity · 402 | Unfinity | 402 | Rare | €0.28 |
| OmnipresenceReality Fracture · 110 | Reality Fracture | 110 | Mythic Rare | $1.87 |
| OmnipresenceReality Fracture · 331 | Reality Fracture | 331 | Mythic Rare | $3.26 |
| OmnipresenceReality Fracture · 448 | Reality Fracture | 448 | Mythic Rare | $3.53 |
| OmnipresenceReality Fracture · 459 | Reality Fracture | 459 | Mythic Rare | €223.74 |
| OmnipresenceReality Fracture Promos · 110p | Reality Fracture Promos | 110p | Mythic Rare | €1.78 |
| Omnipresent ImpostorMystery Booster 2 Tokens · 504 | Mystery Booster 2 Tokens | 504 | Rare | €0.37 |
| OmniscienceFoundations · 161 | Foundations | 161 | Mythic Rare | €4.82 |
| OmniscienceFoundations · 312 | Foundations | 312 | Mythic Rare | €9.54 |
| OmniscienceFoundations · 379 | Foundations | 379 | Mythic Rare | €60.98 |
| OmniscienceMagic 2013 · 63 | Magic 2013 | 63 | Mythic Rare | €6.25 |
| OmniscienceCore Set 2019 · 65 | Core Set 2019 | 65 | Mythic Rare | €5.57 |
| OmniscienceAmonkhet Invocations · 34 | Amonkhet Invocations | 34 | Special | €100.80 |
| OmniscienceJudge Gift Cards 2022 · 2 | Judge Gift Cards 2022 | 2 | Rare | €16.40 |
| OmniscienceFoundations Promos · 161s | Foundations Promos | 161s | Mythic Rare | €6.35 |
| OmniscienceCore Set 2019 Promos · 65s | Core Set 2019 Promos | 65s | Mythic Rare | €10.24 |
| OmniscienceWilds of Eldraine: Enchanting Tales · 24 | Wilds of Eldraine: Enchanting Tales | 24 | Mythic Rare | €6.69 |
| OmniscienceWilds of Eldraine: Enchanting Tales · 70 | Wilds of Eldraine: Enchanting Tales | 70 | Mythic Rare | €19.51 |
| OmniscienceWilds of Eldraine: Enchanting Tales · 90 | Wilds of Eldraine: Enchanting Tales | 90 | Mythic Rare | €245.05 |
| Omniscience // OmniscienceFoundations Art Series · 32 | Foundations Art Series | 32 | — | — |
| Omniscience // OmniscienceWilds of Eldraine Art Series · 68 | Wilds of Eldraine Art Series | 68 | — | — |
| Omniscience // OmniscienceWilds of Eldraine Art Series · 78 | Wilds of Eldraine Art Series | 78 | — | — |
| Omnispell AdeptGuilds of Ravnica · 49 | Guilds of Ravnica | 49 | Rare | €0.13 |
| Omnivorous FlytrapDuskmourn: House of Horror · 192 | Duskmourn: House of Horror | 192 | Rare | €0.14 |
| Omnivorous FlytrapDuskmourn: House of Horror · 322 | Duskmourn: House of Horror | 322 | Rare | €0.25 |
| Omnivorous FlytrapDuskmourn: House of Horror Promos · 192p | Duskmourn: House of Horror Promos | 192p | Rare | $0.27 |
| Omnivorous FlytrapDuskmourn: House of Horror Promos · 192s | Duskmourn: House of Horror Promos | 192s | Rare | $0.51 |
| Omo, Queen of VesuvaModern Horizons 3 Commander · 2 | Modern Horizons 3 Commander | 2 | Mythic Rare | €0.16 |
| Omo, Queen of VesuvaModern Horizons 3 Commander · 14 | Modern Horizons 3 Commander | 14 | Mythic Rare | €0.71 |
| Omo, Queen of VesuvaModern Horizons 3 Commander · 22 | Modern Horizons 3 Commander | 22 | Mythic Rare | €0.38 |
| Omo, Queen of VesuvaModern Horizons 3 Commander · 30 | Modern Horizons 3 Commander | 30 | Mythic Rare | €0.31 |
| Omo, Queen of VesuvaModern Horizons 3 Commander · 141 | Modern Horizons 3 Commander | 141 | Mythic Rare | €5.57 |
| Omo, Queen of VesuvaModern Horizons 3 Commander · 145 | Modern Horizons 3 Commander | 145 | Mythic Rare | €0.02 |
| Omo, Queen of VesuvaModern Horizons 3 Commander · 149 | Modern Horizons 3 Commander | 149 | Mythic Rare | $0.14 |
| O-NaginataDouble Masters · 278 | Double Masters | 278 | Uncommon | €0.20 |
| O-NaginataSaviors of Kamigawa · 157 | Saviors of Kamigawa | 157 | Uncommon | €0.41 |
| O-NaginataThe List Tokens · SOK-157 | The List Tokens | SOK-157 | Uncommon | €0.25 |