| 115 | Unstable Hulk | Ron Spencer | Red | R | Legions |
| Unstable Mutation | Charles Gillespie | Blue | C | Fifth Edition |
| Unstable Mutation | Douglas Shuler | Blue | C | Fourth Edition |
| Unstable Mutation | Douglas Shuler | Blue | C | Revised Edition |
| Unstable Mutation | Douglas Shuler | Blue | C | Arabian Nights |
| 33 | Unstable Mutation | Douglas Shuler | Blue | S | Time Spiral "Timeshifted" |
| 80 | Unstable Mutation | Slawomir Maniak | Blue | U | Ultimate Masters |
| 58 | Unstable Obelisk | William Wu | | U | Commander 2014 |
| 170 | Unstable Obelisk | William Wu | | U | Innistrad: Crimson Vow Commander |
| 220 | Unstable Obelisk | William Wu | | U | Adventures in the Forgotten Realms Commander |
| 227 | Unstable Obelisk | William Wu | | U | Commander 2018 |
| 227 | Unstable Obelisk | William Wu | | U | Commander Anthology 2018 |
| 229 | Unstable Obelisk | William Wu | | U | Commander 2017 |
| 260 | Unstable Obelisk | Johannes Mücke | | C | Warhammer 40,000 Commander |
| 272 | Unstable Obelisk | William Wu | | U | Commander 2021 |
| 416 | Unstable Obelisk | William Wu | | C | Commander Masters |
| 489 | Unstable Obelisk | William Wu | | U | Jumpstart |
| 47 | Unstable Robot Dragon | Larissa Hasenheit, Mina Jeon, Daria Sergeyeva, Sam Burley | | C | Unfinity |
| Unstable Shapeshifter | Terese Nielsen | Blue | R | Tempest |
| 137 | Unstoppable Ash | Brian Snoddy | Green | R | Morningtide |
| 169 | Unstoppable Ogre | Xavier Ribeiro | Red | C | Kamigawa: Neon Dynasty |
| 119 | Unstoppable Slasher | Maxime Minard | Black | R | Duskmourn: House of Horror |
| 294 | Unstoppable Slasher | Maxime Minard | Black | R | Duskmourn: House of Horror |
| 312 | Unstoppable Slasher | SchmandrewART | Black | R | Duskmourn: House of Horror |
| 79 | Unsubstantiate | Victor Adame Minguez | Blue | U | Eldritch Moon |
| 82 | Unsubstantiate | Victor Adame Minguez | Blue | U | Core Set 2021 |
| Unsummon | Douglas Shuler | Blue | C | Fifth Edition |
| Unsummon | Douglas Shuler | Blue | C | Fourth Edition |
| Unsummon | Douglas Shuler | Blue | C | Revised Edition |
| Unsummon | Douglas Schuler | Blue | C | Unlimited Edition |
| Unsummon | Douglas Schuler | Blue | C | Limited Edition Beta |
| Unsummon | Douglas Schuler | Blue | C | Limited Edition Alpha |
| 13 | Unsummon | Izzy | Blue | C | Explorers of Ixalan |
| 36 | Unsummon | Izzy | Blue | C | Arena Base Set |
| 37 | Unsummon | Izzy | Blue | C | Conflux |
| 54 | Unsummon | Nils Hamm | Blue | C | Hour of Devastation |
| 75 | Unsummon | Izzy | Blue | C | Magic 2013 |
| 78 | Unsummon | Izzy | Blue | C | Core Set 2020 |
| 78 | Unsummon | Izzy | Blue | C | Magic 2011 |
| 79 | Unsummon | Izzy | Blue | C | Magic 2012 |
| 79 | Unsummon | Izzy | Blue | C | Magic 2010 |
| 103 | Unsummon | Douglas Shuler | Blue | C | Classic Sixth Edition |
| 108 | Unsummon | Ron Spencer | Blue | C | Seventh Edition |
| 112 | Unsummon | Ron Spencer | Blue | C | Eighth Edition |
| 122 | Unsummon | Ron Spencer | Blue | C | Tenth Edition |
| 285 | Untaidake, the Cloud Keeper | John Avon | | R | Champions of Kamigawa |
| 20 | Untamed Hunger | Willian Murai | Black | C | Welcome Deck 2017 |
| 91 | Untamed Hunger | Willian Murai | Black | C | Oath of the Gatewatch |
| 186 | Untamed Kavu | Yongjae Choi | Green | U | Dominaria |
| 131 | Untamed Might | Erica Yang | Green | C | Scars of Mirrodin |
| 187 | Untamed Pup | Randy Vargas | Green | U | Innistrad: Midnight Hunt |
| Untamed Wilds | Jeffrey R. Busch | Green | U | Portal Second Age |
| Untamed Wilds | Romas | Green | U | Portal |
| Untamed Wilds | NéNé Thomas | Green | U | Fifth Edition |
| Untamed Wilds | NéNé Thomas | Green | U | Fourth Edition |
| Untamed Wilds | NéNé Thomas | Green | U | Legends |
| 148 | Untamed Wilds | NéNé Thomas | Green | U | Starter 1999 |
| 263 | Untamed Wilds | NéNé Thomas | Green | U | Classic Sixth Edition |
| 279 | Untamed Wilds | Thomas Gianni | Green | U | Seventh Edition |
| 179 | Untethered Express | James Ryman | | U | Aether Revolt |
| 274 | Untethered Express | James Ryman | | U | Kaladesh Remastered |
| 161 | Untimely Malfunction | Jarel Threat | Red | U | Duskmourn: House of Horror |
| 39 | Unwanted Remake | Eli Minaya | White | U | Duskmourn: House of Horror |
| 306 | Unwanted Remake | Ivan Shavrin | White | U | Duskmourn: House of Horror |
| 36 | Unwavering Initiate | Greg Opalinski | White | C | Amonkhet |
| 90 | Unwilling Ingredient | David Auden Nash | Black | C | Strixhaven: School of Mages |
| 64 | Unwilling Recruit | Dave Allsop | Red | U | Eventide |
| 81 | Unwilling Vessel | Josu Hernaiz | Blue | U | Duskmourn: House of Horror |
| 72 | Unwind | Anna Steinbauer | Blue | C | Dominaria |
| 61 | Unwinding Clock | Mike Bierek | | R | The Brothers' War Retro Artifacts |
| 124 | Unwinding Clock | David Astruga | | R | The Brothers' War Retro Artifacts |
| 164 | Unwinding Clock | Mike Bierek | | R | New Phyrexia |
| 228 | Unwinding Clock | Mike Bierek | | R | Commander 2018 |
| 163 | Unworthy Dead | Carl Critchlow | Black | C | Urza's Saga |
| Unyaro Bee Sting | Pat Morrissey | Green | U | Mirage |
| 231 | Unyaro Bees | Tom Wänerstrand | Green | R | Time Spiral |
| Unyaro Griffin | Al Davidson | White | U | Mirage |
| 49 | Unyaro Griffin | Al Davidson | White | U | Classic Sixth Edition |
| 35 | Unyielding Gatekeeper | Borja Pindado | White | R | Murders at Karlov Manor |
| 392 | Unyielding Gatekeeper | Borja Pindado | White | R | Murders at Karlov Manor |
| 94 | Unyielding Krumar | Viktor Titov | Black | C | Khans of Tarkir |
| 195 | Up the Beanstalk | Lucas Graciano | Green | U | Wilds of Eldraine |
| Updraft | John Matson | Blue | C | Fifth Edition |
| Updraft | L. A. Williams | Blue | U | Ice Age |
| 82 | Updraft Elemental | Raf Sarmento | Blue | C | Dragons of Tarkir |
| 13 | Upheaval | Kev Walker | Blue | M | From the Vault: Annihilation (2014) |
| 100 | Upheaval | Kev Walker | Blue | M | Vintage Masters |
| 113 | Upheaval | Kev Walker | Blue | R | Odyssey |
| 270 | Upheaval | Kev Walker | Blue | R | Modern Horizons 2 |
| 222 | Uphill Battle | Pete Venters | Red | U | Mercadian Masques |
| 170 | Upriser Renegade | David Auden Nash | Red | U | Kamigawa: Neon Dynasty |
| 324 | Upriser Renegade | まじ/MAJI | Red | U | Kamigawa: Neon Dynasty |
| 149 | Uproot | Heather Hudson | Green | C | Betrayers of Kamigawa |
| 131 | Upwelling | John Avon | Green | R | Scourge |
| 306 | Upwelling | Chippy | Green | R | Tenth Edition |
| 169 | Urabrask | Campbell White | Red | M | March of the Machine |
| 299 | Urabrask | Kekai Kotaki | Red | M | March of the Machine |
| 15 | Urabrask the Hidden | Brad Rigney | Red | M | Historic Anthology 5 |
| 23 | Urabrask the Hidden | Flavio Girón | Red | M | March of the Machine Multiverse Legends |
| 98 | Urabrask the Hidden | Brad Rigney | Red | M | New Phyrexia |
| 152 | Urabrask the Hidden | Brad Rigney | Red | M | Iconic Masters |
| 811 | Urabrask the Hidden | Brad Rigney | Red | M | Commander Legends: Battle for Baldur's Gate |
| 129 | Urabrask, Heretic Praetor | Simon Dominic | Red | M | Streets of New Capenna |
| 346 | Urabrask, Heretic Praetor | Igor Kieryluk | Red | M | Streets of New Capenna |
| 360 | Urabrask, Heretic Praetor | Simon Dominic | Red | M | Streets of New Capenna |
| 152 | Urabrask's Anointer | Aaron J. Riley | Red | U | Phyrexia: All Will Be One |
| 293 | Urabrask's Anointer | JungShan | Red | U | Phyrexia: All Will Be One |
| 153 | Urabrask's Forge | Lie Setiawan | Red | R | Phyrexia: All Will Be One |
| 387 | Urabrask's Forge | Lie Setiawan | Red | R | Phyrexia: All Will Be One |
| 138 | Urban Burgeoning | Nic Klein | Green | C | Return to Ravnica |
| 181 | Urban Daggertooth | Randy Vargas | Green | C | Modern Horizons 2 |
| 57 | Urban Evolution | Eytan Zana | Blue/Green | U | Duel Decks: Elspeth vs. Kiora |
| 126 | Urban Evolution | Eytan Zana | Blue/Green | U | Guild Kit: Simic |
| 198 | Urban Evolution | Eytan Zana | Blue/Green | U | Modern Masters 2017 Edition |
| 204 | Urban Evolution | Eytan Zana | Blue/Green | U | Gatecrash |
| 205 | Urban Evolution | Eytan Zana | Blue/Green | U | Commander 2019 |
| 208 | Urban Evolution | Eytan Zana | Blue/Green | U | Ultimate Masters |
| 276 | Urban Evolution | Eytan Zana | Blue/Green | U | Modern Horizons 3 Commander |
| 355 | Urban Evolution | Eytan Zana | Blue/Green | U | Streets of New Capenna Commander |
| 455 | Urban Evolution | Eytan Zana | Blue/Green | U | Commander Legends |
| 146 | Urban Utopia | Jedd Chevrier | Green | C | Guilds of Ravnica |
| 27 | Urbis Protector | Magali Villeneuve | White | U | Modern Masters 2017 Edition |
| 27 | Urbis Protector | Steve Argyle | White | U | Gatecrash |
| 33 | Urbis Protector | Steve Argyle | White | U | Ravnica Remastered |
| 37 | Urbis Protector | Magali Villeneuve | White | U | Masters 25 |
| 79 | Urbis Protector | Steve Argyle | White | U | Ravnica Clue Edition |
| Urborg | Bryon Wackwitz | | U | Legends |
| 214 | Urborg | Bryon Wackwitz | | U | Masters Edition III |
| 519 | Urborg | Greg and Tim Hildebrandt | | R | The Lord of the Rings: Tales of Middle Earth Commander |
| 231 | Urborg Drake | Sam Wood | Blue/Black | C | Battlebond |
| 283 | Urborg Drake | Sam Wood | Blue/Black | U | Invasion |
| 90 | Urborg Elf | Bob Petillo | Green | C | Apocalypse |
| 131 | Urborg Emissary | Eric Peterson | Black | U | Invasion |
| Urborg Justice | Gary Leach | Black | R | Weatherlight |
| 186 | Urborg Lhurgoyf | Andrey Kuzinskiy | Green | R | Dominaria United |
| 420 | Urborg Lhurgoyf | Andrey Kuzinskiy | Green | R | Dominaria United |
| Urborg Mindsucker | Tony DiTerlizzi | Black | C | Visions |
| Urborg Panther | Cliff Nielsen | Black | C | Mirage |
| 132 | Urborg Phantom | Daren Bader | Black | C | Invasion |
| 114 | Urborg Repossession | Cristi Balanescu | Black | C | Dominaria United |
| 15 | Urborg Scavengers | Svetlin Velinov | Black | R | March of the Machine: The Aftermath |
| 65 | Urborg Scavengers | Nino Vecia | Black | R | March of the Machine: The Aftermath |
| 115 | Urborg Scavengers | Svetlin Velinov | Black | R | March of the Machine: The Aftermath |
| 158 | Urborg Scavengers | Svetlin Velinov | Black | R | March of the Machine: The Aftermath |
| 199 | Urborg Scavengers | Nino Vecia | Black | R | March of the Machine: The Aftermath |
| 133 | Urborg Shambler | Pete Venters | Black | U | Invasion |
| 134 | Urborg Skeleton | Alan Pollack | Black | C | Invasion |
| Urborg Stalker | Cliff Nielsen | Black | R | Weatherlight |
| 27 | Urborg Syphon-Mage | Greg Staples | Black | C | Archenemy |
| 40 | Urborg Syphon-Mage | Greg Staples | Black | C | Duel Decks Anthology, Garruk vs. Liliana |
| 40 | Urborg Syphon-Mage | Greg Staples | Black | C | Duel Decks: Garruk vs. Liliana |
| 106 | Urborg Syphon-Mage | Greg Staples | Black | C | Dominaria Remastered |
| 139 | Urborg Syphon-Mage | Greg Staples | Black | C | Time Spiral |
| 148 | Urborg Syphon-Mage | Greg Staples | Black | C | Time Spiral Remastered |
| 53 | Urborg Uprising | Adam Rex | Black | C | Apocalypse |
| 107 | Urborg Uprising | Adam Rex | Black | C | Dominaria Remastered |
| 111 | Urborg Uprising | Adam Rex | Black | C | Eternal Masters |
| 144 | Urborg Uprising | Adam Rex | Black | C | Vintage Masters |
| 288 | Urborg Volcano | Tony Szczudlo | | U | Commander 2017 |
| 327 | Urborg Volcano | Tony Szczudlo | | U | Eighth Edition |
| 330 | Urborg Volcano | Tony Szczudlo | | U | Invasion |
| 13 | Urborg, Tomb of Yawgmoth | John Avon | | M | From the Vault: Realms |
| 40 | Urborg, Tomb of Yawgmoth | Jung Park | | S | Ultimate Box Toppers |
| 165 | Urborg, Tomb of Yawgmoth | John Avon | | R | Planar Chaos |
| 248 | Urborg, Tomb of Yawgmoth | John Avon | | R | Magic 2015 Core Set |
| 254 | Urborg, Tomb of Yawgmoth | Jung Park | | R | Ultimate Masters |
| 287 | Urborg, Tomb of Yawgmoth | John Avon | | R | Time Spiral Remastered |
| 375 | Urborg, Tomb of Yawgmoth | Erikas Perl | | M | The Lord of the Rings: Tales of Middle Earth Commander |
| Ur-Drago | Christopher Rush | Blue/Black | R | Legends |
| 21 | Urge to Feed | Johann Bodin | Black | U | Explorers of Ixalan |
| 22 | Urge to Feed | Johann Bodin | Black | U | Duel Decks: Sorin vs. Tibalt |
| 70 | Urge to Feed | Johann Bodin | Black | U | Worldwake |
| 139 | Urge to Feed | Johann Bodin | Black | U | Innistrad: Crimson Vow Commander |
| 40 | Urgent Exorcism | Svetlin Velinov | White | C | Innistrad |
| 240 | Urgent Necropsy | Uriah Voth | Black/Green | M | Murders at Karlov Manor |
| 421 | Urgent Necropsy | Uriah Voth | Black/Green | M | Murders at Karlov Manor |
| 155 | Ur-Golem's Eye | Heather Hudson | | C | Darksteel |
| 280 | Ur-Golem's Eye | Heather Hudson | | U | Commander 2014 |
| 314 | Ur-Golem's Eye | Heather Hudson | | U | Ninth Edition |
| 109 | Urgoros, the Empty One | Daarken | Black | U | Dominaria |
| 124 | Uril, the Miststalker | Jaime Jones | White/Red/Green | M | Alara Reborn |
| 290 | Uril, the Miststalker | Jaime Jones | White/Red/Green | M | Double Masters 2022 |
| 548 | Uril, the Miststalker | Jaime Jones | White/Red/Green | M | Double Masters 2022 |
| 266 | Urn of Godfire | Ovidio Cartagena | | C | March of the Machine |
| 93 | Uro, Titan of Nature's Wrath | Vincent Proce | Blue/Green | M | Mystery Booster 2: Convention Edition |
| 222 | Uro, Titan of Nature's Wrath | Richard Luong | Blue/Green | M | Secret Lair Drop |
| 229 | Uro, Titan of Nature's Wrath | Vincent Proce | Blue/Green | M | Theros Beyond Death |
| 277 | Uro, Titan of Nature's Wrath | Vincent Proce | Blue/Green | M | Modern Horizons 3 Commander |
| 188 | Ursapine | Jim Murray | Green | R | Ravnica: City of Guilds |
| 304 | Ursine Champion | Alex Konstad | Green | C | Core Set 2019 |
| 22 | Ursine Fylgja | Yokota Katsumi | White | U | Coldsnap |
| 36 | Ursine Monstrosity | Carlos Palma Cruchaga | Green | R | Duskmourn: House of Horror Commander |
| 63 | Ursine Monstrosity | Carlos Palma Cruchaga | Green | R | Duskmourn: House of Horror Commander |
| 28 | Urtet, Remnant of Memnarch | Simon Dominic | | M | Phyrexia: All Will Be One Commander |
| 42 | Urtet, Remnant of Memnarch | Simon Dominic | | R | Phyrexia: All Will Be One Commander |
| 112 | Uruk-hai Berserker | Victor Harmatiuk | Black | C | The Lord of the Rings: Tales of Middle Earth |
| 563 | Uruk-hai Berserker | Victor Harmatiuk | Black | C | The Lord of the Rings: Tales of Middle Earth |
| 37 | Urza Assembles the Titans | Josu Hernaiz | White | R | Dominaria United |
| 136 | Urza, Academy Headmaster | Terese Nielsen | White/Blue/Black/Red/Green | M | Unstable |
| 2 | Urza, Chief Artificer | Bartłomiej Gaweł | White/Blue/Black | M | The Brothers' War Commander |
| 40 | Urza, Chief Artificer | Bartłomiej Gaweł | White/Blue/Black | M | The Brothers' War Commander |
| 49 | Urza, Chief Artificer | Bartłomiej Gaweł | White/Blue/Black | M | The Brothers' War Commander |
| 71 | Urza, Lord High Artificer | Grzegorz Rutkowski | Blue | M | Dominaria Remastered |
| 75 | Urza, Lord High Artificer | Grzegorz Rutkowski | Blue | M | Modern Horizons |
| 130 | Urza, Lord High Artificer | Grzegorz Rutkowski | Blue | M | Commander Masters |
| 244 | Urza, Lord High Artificer | Mark Tedin | Blue | M | Mystery Booster 2: Convention Edition |
| 296 | Urza, Lord High Artificer | Grzegorz Rutkowski | Blue | M | Dominaria Remastered |
| 423 | Urza, Lord High Artificer | Greg Staples | Blue | M | Dominaria Remastered |
| 502 | Urza, Lord High Artificer | Grzegorz Rutkowski | Blue | M | Commander Masters |
| 674 | Urza, Lord High Artificer | Grant Griffin | Blue | M | Commander Masters |
| 1060 | Urza, Lord High Artificer | Grant Griffin | Blue | M | Commander Masters |
| 225 | Urza, Lord Protector | Ryan Pancoast | White/Blue | M | The Brothers' War |
| 238 | Urza, Planeswalker | Ryan Pancoast | White/Blue | M | The Brothers' War |
| 69 | Urza, Powerstone Prodigy | Donato Giancola | Blue | U | The Brothers' War |
| 226 | Urza, Prince of Kroog | Joshua Raphael | White/Blue | R | The Brothers' War |
| 296 | Urza, Prince of Kroog | Cosmin Podar | White/Blue | R | The Brothers' War |
| 313 | Urza's Armor | rk post | | U | Urza's Saga |
| 318 | Urza's Armor | rk post | | R | Eighth Edition |
| Urza's Avenger | Amy Weber | | R | Fifth Edition |
| Urza's Avenger | Amy Weber | | R | Fourth Edition |
| Urza's Avenger | Amy Weber | | R | Antiquities |
| Urza's Bauble | Christopher Rush | | U | Fifth Edition |
| Urza's Bauble | Christopher Rush | | U | Ice Age |
| 170 | Urza's Bauble | Christopher Rush | | U | Masters Edition |
| 237 | Urza's Bauble | Ernanda Souza | | U | Mystery Booster 2: Convention Edition |
| 137 | Urza's Blueprints | Tom Wänerstrand | | R | Urza's Legacy |
| 238 | Urza's Blueprints | Tom Wänerstrand | | R | Dominaria Remastered |
| 391 | Urza's Blueprints | Tom Wänerstrand | | R | Dominaria Remastered |
| 234 | Urza's Cave | Mark Poole | | U | Modern Horizons 3 |
| Urza's Chalice | Jeff A. Menges | | C | Antiquities |
| 171 | Urza's Chalice | Jeff A. Menges | | C | Masters Edition |
| 236 | Urza's Chalice | Jeff A. Menges | | C | Masters Edition IV |
| 70 | Urza's Command | Dominik Mayer | Blue | R | The Brothers' War |
| 318 | Urza's Command | Dominik Mayer | Blue | R | The Brothers' War |
| 82 | Urza's Contact Lenses | David A. Cherry | | U | Unglued |
| 4 | Urza's Dark Cannonball | Larissa Hasenheit, Mina Jeon, Daria Sergeyeva, Sam Burley | | C | Unfinity |
| Urza's Engine | Greg Simanson | | U | Alliances |