| 4+ | Oracle's Attendants | MTGNemesis_016 |
| 2 | Oracle's Insight | MTGBornofGods_047 |
| 2 | Oracle's Insight (Foil) | MTGBornofGods_047F |
| 2 | Oracle's Vault | MTGAmonkhet_234 |
| 4+ | Oracle’s Attendants | MTG9ED_030 |
| 4+ | Orah, Skyclave Hierophant | MTGZendikarRising_233 |
| 1 | Orah, Skyclave Hierophant (Buy a Box Promo) (Foil) | MTGZendikarRising_385F |
| 1 | Orah, Skyclave Hierophant (Extended Art) | MTGZendikarRising_369 |
| 1 | Orah, Skyclave Hierophant (Extended Art) (Foil) | MTGZendikarRising_369F |
| 1 | Orah, Skyclave Hierophant (Foil) | MTGZendikarRising_233F |
| 3 | Oran-Rief Ooze | MTGZendikarRising_198 |
| 4+ | Oran-Rief Recluse | MTGZendikar_173 |
| 4+ | Oran-Rief Recluse | MTGDDJvsV_054 |
| 4+ | Oran-Rief Survivalist | MTGZendikar_174 |
| 2 | Oran-Rief Survivalist Foil | MTGZendikar_174F |
| 4+ | Orator of Ojutai | MTGDragonsofTarkir_028 |
| 1 | Orator of Ojutai | MTGCommander2017_067 |
| 4+ | Oraxid | MTGNemesis_035 |
| 2 | Oraxid FOIL | MTGNemesis_035F |
| 4+ | Orazca Frillback | MTGRivals of Ixalan_140 |
| 4+ | Orazca Raptor | MTGRivals of Ixalan_108 |
| 4+ | Orazca Relic | MTGRivals of Ixalan_181 |
| 4+ | Orazca Relic | MTGAFC_213 |
| 2 | Orb of Dreams | MTGBetrayers_156 |
| 1 | Orbs of Warding | MTGMagicOrigins_234 |
| 4+ | Orbweaver Kumo Foil | MTGChampions_231F |
| 4+ | Orc General | MTGDRK_073 |
| 4+ | Orc Sureshot | MTGFateReforged_078 |
| 4+ | Orchard Spirit | MTGInnistrad_198 |
| 1 | Orchard Spirit FOIL | MTGInnistrad_198F |
|
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