| 188 | Oketra's Monument | Christine Choi | | U | Dominaria United Commander |
| 233 | Oketra's Monument | Christine Choi | | U | Amonkhet |
| 277 | Oketra's Monument | Christine Choi | | U | Amonkhet Remastered |
| 117 | Okiba Reckoner Raid | Victor Adame Minguez | Black | C | Kamigawa: Neon Dynasty |
| 118 | Okiba Salvage | Lie Setiawan | Black | U | Kamigawa: Neon Dynasty |
| 35 | Okiba-Gang Shinobi | Mark Zug | Black | C | Planechase Anthology |
| 35 | Okiba-Gang Shinobi | Mark Zug | Black | C | Planechase 2012 Edition |
| 76 | Okiba-Gang Shinobi | Mark Zug | Black | C | Betrayers of Kamigawa |
| 111 | Okiba-Gang Shinobi | Mark Zug | Black | C | Jumpstart: Historic Horizons |
| 140 | Okina Nightwatch | Heather Hudson | Green | C | Saviors of Kamigawa |
| 280 | Okina, Temple to the Grandfathers | Keith Garletts | | R | Champions of Kamigawa |
| 204 | Okk | Peter Bollinger | Red | R | Seventh Edition |
| 204 | Okk | Mike Raabe | Red | R | Urza's Saga |
| 206 | Okk | Peter Bollinger | Red | R | Eighth Edition |
| 223 | Oko, the Ringleader | Magali Villeneuve | Blue/Green | M | Outlaws of Thunder Junction |
| 296 | Oko, the Ringleader | Dibujante Nocturno | Blue/Green | M | Outlaws of Thunder Junction |
| 305 | Oko, the Ringleader | Lie Setiawan | Blue/Green | M | Outlaws of Thunder Junction |
| 309 | Oko, the Trickster | Chris Rallis | Blue/Green | M | Throne of Eldraine |
| 50 | Oko, Thief of Crowns | Michael Walsh | Blue/Green | M | Outlaws of Thunder Junction Breaking News |
| 77 | Oko, Thief of Crowns | Michael Walsh | Blue/Green | M | Outlaws of Thunder Junction Breaking News |
| 197 | Oko, Thief of Crowns | Yongjae Choi | Blue/Green | M | Throne of Eldraine |
| 310 | Oko's Accomplices | Zezhou Chen | Blue | C | Throne of Eldraine |
| 312 | Oko's Hospitality | Deruchenko Alexander | Blue/Green | R | Throne of Eldraine |
| 134 | Ol' Buzzbark | Wayne Reynolds | Red/Green | M | Unstable |
| 233 | Olag, Ludevic's Hubris | Ryan Pancoast | Blue/Black | R | Innistrad: Midnight Hunt |
| 320 | Olag, Ludevic's Hubris | Milivoj Ćeran | Blue/Black | R | Innistrad: Midnight Hunt |
| 316 | Old Flitterfang | Chris Seaman | Black | U | Wilds of Eldraine |
| 67 | Old Fogey | Douglas Shuler | Green | R | Unsanctioned |
| 106 | Old Fogey | Douglas Schuler | Green | R | Unhinged |
| 232 | Old Ghastbark | Thomas M. Baxa | White/Green | C | Shadowmoor |
| 197 | Old Gnawbone | Filip Burburan | Green | M | Adventures in the Forgotten Realms |
| 296 | Old Gnawbone | Randy Vargas | Green | M | Adventures in the Forgotten Realms |
| 11 | Old Guard | David Sladek | White | C | Unsanctioned |
| 16 | Old Guard | David Sladek | White | C | Unstable |
| Old Man of the Sea | Susan Van Camp | Blue | R | Arabian Nights |
| 45 | Old Man of the Sea | Susan Van Camp | Blue | R | Masters Edition III |
| 217 | Old Man Willow | Miklós Ligeti | Black/Green | U | The Lord of the Rings: Tales of Middle Earth |
| 668 | Old Man Willow | Miklós Ligeti | Black/Green | U | The Lord of the Rings: Tales of Middle Earth |
| 96 | Old One Eye | Mathias Kollros | Green | R | Warhammer 40,000 Commander |
| 244 | Old Rutstein | Greg Staples | Black/Green | R | Innistrad: Crimson Vow |
| 326 | Old Rutstein | Mark Riddick | Black/Green | R | Innistrad: Crimson Vow |
| 227 | Old Stickfingers | Jehan Choo | Black/Green | R | Duskmourn: House of Horror Commander |
| 234 | Old Stickfingers | Jehan Choo | Black/Green | R | Innistrad: Midnight Hunt |
| 321 | Old Stickfingers | DZO | Black/Green | R | Innistrad: Midnight Hunt |
| 62 | Old-Fashioned Vampire | Simon Dominic | Black | U | Unstable |
| 199 | Old-Growth Dryads | Yongjae Choi | Green | R | Ixalan |
| 256 | Old-Growth Grove | Raoul Vitale | | U | Modern Horizons 3 |
| 185 | Old-Growth Troll | Jesper Ejsing | Green | R | Kaldheim |
| 365 | Old-Growth Troll | Jesper Ejsing | Green | R | Kaldheim |
| 139 | Oliphaunt | John Di Giovanni | Red | C | The Lord of the Rings: Tales of Middle Earth |
| 426 | Oliphaunt | Tyler Jacobson | Red | C | The Lord of the Rings: Tales of Middle Earth |
| 590 | Oliphaunt | John Di Giovanni | Red | C | The Lord of the Rings: Tales of Middle Earth |
| 177 | Olivia Voldaren | Eric Deschamps | Black/Red | M | Modern Masters 2017 Edition |
| 215 | Olivia Voldaren | Eric Deschamps | Black/Red | M | Innistrad |
| 245 | Olivia, Crimson Bride | Anna Steinbauer | Black/Red | M | Innistrad: Crimson Vow |
| 315 | Olivia, Crimson Bride | Xiaobotong | Black/Red | M | Innistrad: Crimson Vow |
| 343 | Olivia, Crimson Bride | Bastien L. Deharme | Black/Red | M | Innistrad: Crimson Vow |
| 239 | Olivia, Mobilized for War | Eric Deschamps | Black/Red | M | Shadows Over Innistrad Remastered |
| 248 | Olivia, Mobilized for War | Eric Deschamps | Black/Red | M | Shadows over Innistrad |
| 2 | Olivia, Opulent Outlaw | Anna Steinbauer | White/Black/Red | M | Outlaws of Thunder Junction Commander |
| 172 | Olivia's Attendants | Dmitry Burmak | Red | R | Innistrad: Crimson Vow |
| 307 | Olivia's Attendants | Christian Angel | Red | R | Innistrad: Crimson Vow |
| 127 | Olivia's Bloodsworn | Daarken | Black | U | Shadows Over Innistrad Remastered |
| 127 | Olivia's Bloodsworn | Daarken | Black | U | Shadows over Innistrad |
| 100 | Olivia's Dragoon | Chris Rallis | Black | C | Eldritch Moon |
| 109 | Olivia's Dragoon | Chris Rallis | Black | C | Ultimate Masters |
| 128 | Olivia's Dragoon | Chris Rallis | Black | C | Shadows Over Innistrad Remastered |
| 118 | Olivia's Midnight Ambush | Chris Rallis | Black | C | Innistrad: Midnight Hunt |
| 20 | Olivia's Wrath | Nestor Ossandon Leal | Black | R | Innistrad: Crimson Vow Commander |
| 58 | Olivia's Wrath | Nestor Ossandon Leal | Black | R | Innistrad: Crimson Vow Commander |
| 205 | Olivia's Wrath | Néstor Ossandón Leal | Black | R | The Lost Caverns of Ixalan Commander |
| 27 | Ollenbock Escort | Eric Wilkerson | White | U | Innistrad: Crimson Vow |
| 140 | Olog-hai Crusher | Andrea Piparo | Red | C | The Lord of the Rings: Tales of Middle Earth |
| 591 | Olog-hai Crusher | Andrea Piparo | Red | C | The Lord of the Rings: Tales of Middle Earth |
| 503 | Olórin's Searing Light | Matt Stewart | White/Red | R | The Lord of the Rings: Tales of Middle Earth Commander |
| 203 | Oloro, Ageless Ascetic | Eric Deschamps | White/Blue/Black | M | Commander 2013 Edition |
| 27 | Oltec Archaeologists | Winona Nelson | White | C | The Lost Caverns of Ixalan |
| 28 | Oltec Cloud Guard | Evyn Fong | White | C | The Lost Caverns of Ixalan |
| 3 | Oltec Matterweaver | Villarrte | White | M | Outlaws of Thunder Junction: The Big Score |
| 33 | Oltec Matterweaver | Inkognit | White | M | Outlaws of Thunder Junction: The Big Score |
| 68 | Oltec Matterweaver | Villarrte | White | M | Outlaws of Thunder Junction: The Big Score |
| 708 | Omarthis, Ghostfire Initiate | Brent Hollowell | | M | Commander Masters |
| 748 | Omarthis, Ghostfire Initiate | Brent Hollowell | | M | Commander Masters |
| 223 | Omega Myr | Dany Orizio | | C | Mirrodin |
| Omen | Eric Peterson | Blue | C | Portal |
| 70 | Omen Hawker | Josh Hass | Blue | U | March of the Machine |
| 148 | Omen Machine | David Rapoza | | R | New Phyrexia |
| Omen of Fire | Pete Venters | Red | R | Alliances |
| 110 | Omen of the Dead | Piotr Dura | Black | C | Theros Beyond Death |
| 145 | Omen of the Forge | Piotr Dura | Red | C | Theros Beyond Death |
| 192 | Omen of the Hunt | Piotr Dura | Green | C | Theros Beyond Death |
| 906 | Omen of the Hunt | Piotr Dura | Green | C | Commander Masters |
| 58 | Omen of the Sea | Piotr Dura | Blue | C | Theros Beyond Death |
| 30 | Omen of the Sun | Piotr Dura | White | C | Theros Beyond Death |
| 831 | Omen of the Sun | Piotr Dura | White | C | Commander Masters |
| 18 | Omenpath Journey | Nereida | Green | M | Outlaws of Thunder Junction: The Big Score |
| 48 | Omenpath Journey | Raymond Swanland | Green | M | Outlaws of Thunder Junction: The Big Score |
| 83 | Omenpath Journey | Nereida | Green | M | Outlaws of Thunder Junction: The Big Score |
| 616 | Omenpath to Naya (playtest) | Sandy Lee | | R | Mystery Booster 2: Convention Edition |
| 21 | Omenport Vigilante | Forrest Imel | White | U | Outlaws of Thunder Junction |
| 39 | Omenspeaker | Dallas Williams | Blue | C | Duel Decks: Elspeth vs. Kiora |
| 57 | Omenspeaker | Dallas Williams | Blue | C | Theros |
| 64 | Omenspeaker | Dallas Williams | Blue | C | Core Set 2019 |
| 83 | Omenspeaker | Dallas Williams | Blue | C | Commander Legends |
| 118 | Omenspeaker | Dallas Williams | Blue | C | Conspiracy: Take the Crown |
| 125 | Omenspeaker | Dallas Williams | Blue | C | Battlebond |
| 189 | Ominous Cemetery | Anato Finnstark | | U | Doctor Who Commander |
| 241 | Ominous Parcel | Joe Slucher | | C | Streets of New Capenna |
| 65 | Ominous Roost | Josu Hernaiz | Blue | U | Innistrad: Midnight Hunt |
| 61 | Ominous Seas | Vincent Proce | Blue | U | Ikoria: Lair of Behemoths |
| 41 | Ominous Sphinx | Lars Grant-West | Blue | U | Hour of Devastation |
| 72 | Ominous Sphinx | Lars Grant-West | Blue | U | Amonkhet Remastered |
| 62 | Ominous Traveler | Igor Kieryluk | | R | Innistrad: Midnight Hunt Alchemy |
| 249 | Omnath, Locus of All | Bryan Sola | White/Blue/Black/Red/Green | R | March of the Machine |
| 313 | Omnath, Locus of All | Jessica Rossier | White/Blue/Black/Red/Green | R | March of the Machine |
| 387 | Omnath, Locus of All | Helge C. Balzer | White/Blue/Black/Red/Green | R | March of the Machine |
| 232 | Omnath, Locus of Creation | Chris Rahn | White/Blue/Red/Green | M | Zendikar Rising |
| 312 | Omnath, Locus of Creation | Bastien Grivet | White/Blue/Red/Green | M | Zendikar Rising |
| 2 | Omnath, Locus of Mana | Chase Stone | Green | M | Commander Collection: Green |
| 7 | Omnath, Locus of Mana | Mike Bierek | Green | M | From the Vault: Legends |
| 109 | Omnath, Locus of Mana | Mike Bierek | Green | M | Worldwake |
| 310 | Omnath, Locus of Mana | Mike Bierek | Green | M | Commander Masters |
| 568 | Omnath, Locus of Mana | Mike Bierek | Green | M | Commander Masters |
| 680 | Omnath, Locus of Mana | Alex Dos Diaz | Green | M | Commander Masters |
| 1063 | Omnath, Locus of Mana | Alex Dos Diaz | Green | M | Commander Masters |
| 97 | Omnath, Locus of Rage | Brad Rigney | Red/Green | M | Zendikar Rising Commander |
| 217 | Omnath, Locus of Rage | Brad Rigney | Red/Green | M | Battle for Zendikar |
| 236 | Omnath, Locus of Rage | Brad Rigney | Red/Green | M | Outlaws of Thunder Junction Commander |
| 216 | Omnath, Locus of the Roil | Lius Lasahido | Blue/Red/Green | M | Core Set 2020 |
| 119 | Omnibian | Jim Nelson | Blue/Green | R | Dissension |
| 121 | Omnibian | Jim Nelson | Blue/Green | R | Guild Kit: Simic |
| 116 | Omniclown Colossus | Ralph Horsley | Red | R | Unfinity (Acorn) |
| 504 | Omnipresent Impostor (playtest) | Francois Dery | | R | Mystery Booster 2: Convention Edition |
| 24 | Omniscience | Justin & Alexis Hernandez | Blue | M | Wilds of Eldraine Enchanting Tales |
| 34 | Omniscience | Josh Hass | Blue | S | Masterpiece Series: Amonkhet Invocations |
| 63 | Omniscience | Jason Chan | Blue | M | Magic 2013 |
| 65 | Omniscience | Jason Chan | Blue | M | Core Set 2019 |
| 70 | Omniscience | やこたこす/YAKOTAKOS | Blue | M | Wilds of Eldraine Enchanting Tales |
| 161 | Omniscience | Jason Chan | Blue | M | Magic: The Gathering Foundations |
| 312 | Omniscience | Dominik Mayer | Blue | M | Magic: The Gathering Foundations |
| 379 | Omniscience | Dominik Mayer | Blue | M | Magic: The Gathering Foundations |
| 49 | Omnispell Adept | Jason Rainville | Blue | R | Guilds of Ravnica |
| 192 | Omnivorous Flytrap | Antonio José Manzanedo | Green | R | Duskmourn: House of Horror |
| 322 | Omnivorous Flytrap | Chun Lo | Green | R | Duskmourn: House of Horror |
| 2 | Omo, Queen of Vesuva | Alex Brock | Blue/Green | M | Modern Horizons 3 Commander |
| 14 | Omo, Queen of Vesuva | Chun Lo | Blue/Green | M | Modern Horizons 3 Commander |
| 22 | Omo, Queen of Vesuva | Alex Brock | Blue/Green | M | Modern Horizons 3 Commander |
| 30 | Omo, Queen of Vesuva | Alex Brock | Blue/Green | M | Modern Horizons 3 Commander |
| 31 | On Alert | Lie Setiawan | White | C | Throne of Eldraine |
| 28 | On Serra's Wings | Johannes Voss | White | U | Dominaria |
| 380 | On Serra's Wings | Johannes Voss | White | U | Commander Legends |
| 30 | On the Job | Jason A. Engle | White | C | Murders at Karlov Manor |
| 292 | On the Job | Alexander Mokhov | White | C | Murders at Karlov Manor |
| 39 | On the Trail | Erikas Perl | Green | R | Murders at Karlov Manor Commander |
| 349 | On the Trail | Erikas Perl | Green | R | Murders at Karlov Manor Commander |
| 20 | On Thin Ice | Lucas Graciano | White | R | Modern Horizons |
| 157 | O-Naginata | Brian Snoddy | | U | Saviors of Kamigawa |
| 278 | O-Naginata | Brian Snoddy | | U | Double Masters |
| 156 | Onakke Javelineer | Joseph Weston | Red | C | March of the Machine |
| 722 | Onakke Oathkeeper | Arash Radkia | White | R | Commander Masters |
| 755 | Onakke Oathkeeper | Arash Radkia | White | R | Commander Masters |
| 153 | Onakke Ogre | Mathias Kollros | Red | C | Core Set 2019 |
| 155 | Onakke Ogre | Mathias Kollros | Red | C | Core Set 2021 |
| 168 | Once and Future | Nils Hamm | Green | U | Throne of Eldraine |
| 11 | Once More with Feeling | Terese Nielsen | White | R | Unglued |
| 71 | Once Upon a Time | Matt Stewart | Green | R | Mystery Booster 2: Convention Edition |
| 169 | Once Upon a Time | Matt Stewart | Green | R | Throne of Eldraine |
| 149 | Ondu Champion | Volkan Baga | Red | C | Battle for Zendikar |
| 30 | Ondu Cleric | Jim Murray | White | C | Zendikar |
| 19 | Ondu Giant | Igor Kieryluk | Green | C | Duel Decks: Zendikar vs. Eldrazi |
| 71 | Ondu Giant | Igor Kieryluk | Green | C | Planechase Anthology |
| 71 | Ondu Giant | Igor Kieryluk | Green | C | Planechase 2012 Edition |
| 202 | Ondu Giant | Igor Kieryluk | Green | C | Rise of the Eldrazi |
| 698 | Ondu Giant | Igor Kieryluk | Green | C | Jumpstart 2022 |
| 40 | Ondu Greathorn | Aaron Miller | White | C | Battle for Zendikar |
| 30 | Ondu Inversion | James Paick | White | R | Zendikar Rising |
| 321 | Ondu Inversion | James Paick | White | R | Zendikar Rising |
| 196 | Ondu Knotmaster | Jarel Threat | White/Black | U | Modern Horizons 3 |
| 41 | Ondu Rising | Igor Kieryluk | White | U | Battle for Zendikar |
| 30 | Ondu Skyruins | James Paick | | R | Zendikar Rising |
| 321 | Ondu Skyruins | James Paick | | R | Zendikar Rising |
| 101 | Ondu Spiritdancer | Tran Nguyen | White | R | Duskmourn: House of Horror Commander |
| 723 | Ondu Spiritdancer | Tran Nguyen | White | R | Commander Masters |
| 756 | Ondu Spiritdancer | Tran Nguyen | White | R | Commander Masters |
| 31 | Ondu War Cleric | Ben Maier | White | C | Oath of the Gatewatch |