| 45 | Unblinking Bleb | Shishizaru | Blue | C | Future Sight |
| 82 | Unblinking Observer | Filip Burburan | Blue | C | Innistrad: Midnight Hunt |
| 66 | Unbreathing Horde | Dave Kendall | Black | R | Duel Decks: Blessed vs. Cursed |
| 121 | Unbreathing Horde | Dave Kendall | Black | R | Innistrad |
| 164 | Unchained Berserker | Bram Sels | Red | U | Core Set 2020 |
| Uncle Istvan | Daniel Gelon | Black | U | Fourth Edition |
| Uncle Istvan | Daniel Gelon | Black | U | The Dark |
| 51 | Uncle Istvan | Daniel Gelon | Black | S | Time Spiral "Timeshifted" |
| 75 | Unctus, Grand Metatect | Andrew Mar | Blue | R | Phyrexia: All Will Be One |
| 303 | Unctus, Grand Metatect | Sidharth Chaturvedi | Blue | R | Phyrexia: All Will Be One |
| 76 | Unctus's Retrofitter | Cristi Balanescu | Blue | U | Phyrexia: All Will Be One |
| 84 | Undead Alchemist | Michael C. Hayes | Blue | R | Innistrad |
| 105 | Undead Alchemist | Michael C. Hayes | Blue | R | Innistrad: Midnight Hunt Commander |
| 112 | Undead Augur | Sara Winters | Black | U | Modern Horizons |
| 130 | Undead Augur | Sara Winters | Black | U | Innistrad: Midnight Hunt Commander |
| 482 | Undead Augur | Sara Winters | Black | U | Jumpstart 2022 |
| 133 | Undead Butler | Nestor Ossandon Leal | Black | U | Innistrad: Crimson Vow |
| 123 | Undead Executioner | Dave Kendall | Black | C | Avacyn Restored |
| 105 | Undead Gladiator | Slawomir Maniak | Black | U | Dominaria Remastered |
| 112 | Undead Gladiator | Slawomir Maniak | Black | U | Masters 25 |
| 178 | Undead Gladiator | Jeff Easley | Black | R | Onslaught |
| 313 | Undead Gladiator | Slawomir Maniak | Black | U | Dominaria Remastered |
| 90 | Undead Leotau | Carl Critchlow | Black | C | Shards of Alara |
| 119 | Undead Minotaur | Karl Kopinski | Black | C | Magic 2014 Core Set |
| 118 | Undead Servant | James Zapata | Black | C | Core Set 2020 |
| 124 | Undead Servant | James Zapata | Black | C | Magic Origins |
| 37 | Undead Slayer | Eric Fortune | White | U | Magic 2010 |
| 44 | Undead Warchief | Greg Hildebrandt | Black | U | Planechase |
| 52 | Undead Warchief | Greg Hildebrandt | Black | S | Time Spiral "Timeshifted" |
| 78 | Undead Warchief | Greg Hildebrandt | Black | U | Scourge |
| 226 | Undercellar Myconid | David Szabo | Green | C | Alchemy Horizons: Baldur's Gate |
| 259 | Undercellar Myconid | David Szabo | Green | C | Commander Legends: Battle for Baldur's Gate |
| 108 | Undercity Eliminator | Quintin Gleim | Black | U | Murders at Karlov Manor |
| 82 | Undercity Informer | Raymond Swanland | Black | U | Gatecrash |
| 87 | Undercity Necrolisk | Tomasz Jedruszek | Black | U | Guilds of Ravnica |
| 88 | Undercity Scavenger | Tomasz Jedruszek | Black | C | Ravnica Allegiance |
| 126 | Undercity Scrounger | Mike Jordana | Black | C | Kamigawa: Neon Dynasty |
| 110 | Undercity Shade | Dana Knutson | Black | U | Ravnica: City of Guilds |
| 188 | Undercity Troll | Jason Felix | Green | U | Iconic Masters |
| 202 | Undercity Troll | Jason Felix | Green | U | Magic Origins |
| 49 | Undercover Butler | Kim Sokol | Blue/Black | U | Ravnica Clue Edition |
| 239 | Undercover Crocodelf | Nicholas Gregory | Blue/Green | C | Murders at Karlov Manor |
| 239 | Undercover Crocodelf | Nicholas Gregory | Blue/Green | C | Murders at Karlov Manor |
| 63 | Undercover Operative | Tyler Walpole | Blue | R | Streets of New Capenna |
| 414 | Undercover Operative | Tyler Walpole | Blue | R | Streets of New Capenna |
| 208 | Underdark Basilisk | Brent Hollowell | Green | C | Adventures in the Forgotten Realms |
| 227 | Underdark Basilisk | Brent Hollowell | Green | C | Alchemy Horizons: Baldur's Gate |
| 334 | Underdark Basilisk | Pedro Potier | Green | C | Adventures in the Forgotten Realms |
| 49 | Underdark Beholder (playtest) | Chris Tulach | Black | C | Mystery Booster |
| 154 | Underdark Explorer | David Astruga | Black | C | Commander Legends: Battle for Baldur's Gate |
| 197 | Undergrowth Champion | Tyler Jacobson | Green | M | Battle for Zendikar |
| 204 | Undergrowth Scavenger | Nils Hamm | Green | C | Magic 2015 Core Set |
| 260 | Undermountain Adventurer | Michal Ivan | Green | R | Commander Legends: Battle for Baldur's Gate |
| 594 | Undermountain Adventurer | Michal Ivan | Green | R | Commander Legends: Battle for Baldur's Gate |
| 211 | Underrealm Lich | Anna Steinbauer | Black/Green | M | Guilds of Ravnica |
| 215 | Underrealm Lich | Anna Steinbauer | Black/Green | M | Ravnica Clue Edition |
| 78 | Undersea Invader | Lorenzo Mastroianni | Blue | C | Kaldheim |
| 366 | Undersea Invader | Lorenzo Mastroianni | Blue | C | Jumpstart 2022 |
| 53 | Undertaker | Jeff Easley | Black | S | Time Spiral "Timeshifted" |
| 167 | Undertaker | Jeff Easley | Black | C | Mercadian Masques |
| 208 | Underworld Cerberus | Svetlin Velinov | Black/Red | M | Theros |
| 120 | Underworld Charger | Johann Bodin | Black | C | Theros Beyond Death |
| 157 | Underworld Coinsmith | Mark Winters | White/Black | U | Journey into Nyx |
| 237 | Underworld Coinsmith | Mark Winters | White/Black | U | Commander 2015 |
| 105 | Underworld Hermit | Jason A. Engle | Black | U | Modern Horizons 2 |
| 347 | Underworld Hermit | Jason A. Engle | Black | U | Modern Horizons 2 |
| 163 | Underworld Rage-Hound | Tyler Walpole | Red | C | Theros Beyond Death |
| 293 | Underworld Sentinel | Vincent Proce | Black | R | Theros Beyond Death |
| Undying Beast | Steve Luke | Black | C | Portal |
| 52 | Unesh, Criosphinx Sovereign | Adrian Majkrzak | Blue | M | Hour of Devastation |
| 85 | Unesh, Criosphinx Sovereign | Adrian Majkrzak | Blue | M | Amonkhet Remastered |
| 127 | Unforgiving One | Fariba Khamseh | Black | U | Kamigawa: Neon Dynasty |
| 13 | Unhallowed Cathar | Ryan Pancoast | Black | C | Dark Ascension |
| 135 | Unhallowed Phalanx | Nicholas Gregory | Black | C | Innistrad: Crimson Vow |
| 8 | Unholy Fiend | Igor Kieryluk | Black | U | Innistrad |
| 41 | Unholy Officiant | Campbell White | White | C | Innistrad: Crimson Vow |
| 286 | Unholy Officiant | Jason A. Engle | White | C | Innistrad: Crimson Vow |
| 94 | Unimpeded Trespasser | Dan Scott | Blue | U | Shadows over Innistrad |
| 94 | Uninvited Geist | Dan Scott | Blue | U | Shadows over Innistrad |
| 235 | Universal Automaton | Ben Maier | | C | Modern Horizons |
| 803 | Universal Automaton | Ben Maier | | C | Jumpstart 2022 |
| 56 | Unliving Psychopath | Greg Staples | Black | R | Dissension |
| 128 | Unlucky Witness | Tyler Walpole | Red | U | Streets of New Capenna |
| 147 | Unraveling Mummy | Tomasz Jedruszek | White/Black | U | Hour of Devastation |
| 156 | Unruly Catapult | Vincent Christiaens | Red | C | Wilds of Eldraine |
| 50 | Unruly Krasis | Billy Christian | Blue/Green | R | Ravnica Clue Edition |
| 39 | Unruly Mob | Ryan Pancoast | White | C | Innistrad |
| 40 | Unruly Mob | Ryan Pancoast | White | C | Innistrad: Midnight Hunt |
| 47 | Unruly Mob | Ryan Pancoast | White | C | Shadows over Innistrad |
| 109 | Unscrupulous Agent | Michal Ivan | Black | C | Murders at Karlov Manor |
| 112 | Unscrupulous Contractor | Mila Pesic | Black | U | Outlaws of Thunder Junction |
| Unseen Walker | Alan Rabinowitz | Green | U | Mirage |
| 262 | Unseen Walker | Alan Rabinowitz | Green | U | Classic Sixth Edition |
| 216 | Unsettled Mariner | John Stanko | White/Blue | R | Modern Horizons |
| 29 | Unshakable Tail | Sean Murray | Black | R | Murders at Karlov Manor Commander |
| 339 | Unshakable Tail | Sean Murray | Black | R | Murders at Karlov Manor Commander |
| 115 | Unstable Hulk | Ron Spencer | Red | R | Legions |
| 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 |
| 186 | Untamed Kavu | Yongjae Choi | Green | U | Dominaria |
| 187 | Untamed Pup | Randy Vargas | Green | U | Innistrad: Midnight Hunt |
| 36 | Unwavering Initiate | Greg Opalinski | White | C | Amonkhet |
| 90 | Unwilling Ingredient | David Auden Nash | Black | C | Strixhaven: School of Mages |
| 163 | Unworthy Dead | Carl Critchlow | Black | C | Urza's Saga |
| 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 |
| 82 | Updraft Elemental | Raf Sarmento | Blue | C | Dragons of Tarkir |
| 170 | Upriser Renegade | David Auden Nash | Red | U | Kamigawa: Neon Dynasty |
| 324 | Upriser Renegade | まじ/MAJI | Red | U | Kamigawa: Neon Dynasty |
| 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 |
| 181 | Urban Daggertooth | Randy Vargas | Green | C | Modern Horizons 2 |
| 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 |
| 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 |
| 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 |
| 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 |
| Ur-Drago | Christopher Rush | Blue/Black | R | Legends |
| 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 |