| 129 | Ulvenwald Bear | Jason A. Engle | Green | C | Dark Ascension |
| 225 | Ulvenwald Behemoth | Brent Hollowell | Green | R | Innistrad: Crimson Vow |
| 394 | Ulvenwald Behemoth | Brent Hollowell | Green | R | Innistrad: Crimson Vow |
| 175 | Ulvenwald Captive | Chris Rahn | Green | C | Eldritch Moon |
| 221 | Ulvenwald Captive | Chris Rahn | Green | C | Shadows Over Innistrad Remastered |
| 222 | Ulvenwald Hydra | Raymond Swanland | Green | R | Shadows Over Innistrad Remastered |
| 235 | Ulvenwald Hydra | Raymond Swanland | Green | M | Shadows over Innistrad |
| 250 | Ulvenwald Hydra | Raymond Swanland | Green | M | Modern Horizons 3 Commander |
| 439 | Ulvenwald Hydra | Raymond Swanland | Green | M | Jumpstart |
| 160 | Ulvenwald Mysteries | Greg Opalinski | Green | U | Jumpstart: Historic Horizons |
| 184 | Ulvenwald Mysteries | Greg Opalinski | Green | U | Double Masters |
| 193 | Ulvenwald Mysteries | Nereida | Green | U | Murders at Karlov Manor Commander |
| 223 | Ulvenwald Mysteries | Nereida | Green | U | Shadows Over Innistrad Remastered |
| 236 | Ulvenwald Mysteries | Greg Opalinski | Green | U | Shadows over Innistrad |
| 208 | Ulvenwald Mystics | Dan Scott | Green | U | Innistrad |
| 176 | Ulvenwald Observer | Jaime Jones | Green | R | Eldritch Moon |
| 225 | Ulvenwald Oddity | Brent Hollowell | Green | R | Innistrad: Crimson Vow |
| 394 | Ulvenwald Oddity | Brent Hollowell | Green | R | Innistrad: Crimson Vow |
| 208 | Ulvenwald Primordials | Dan Scott | Green | U | Innistrad |
| 144 | Ulvenwald Tracker | Christopher Moeller | Green | R | Modern Masters 2017 Edition |
| 200 | Ulvenwald Tracker | Christopher Moeller | Green | R | Avacyn Restored |
| 65 | Umara Entangler | James Ryman | Blue | C | Oath of the Gatewatch |
| 238 | Umara Mystic | Bryan Sola | Blue/Red | U | Zendikar Rising |
| 75 | Umara Raptor | Sam Wood | Blue | C | Zendikar |
| 86 | Umara Skyfalls | Jesper Ejsing | | U | Zendikar Rising |
| 86 | Umara Wizard | Jesper Ejsing | Blue | U | Zendikar Rising |
| 237 | Umbilicus | Dermot Power | | R | Dominaria Remastered |
| 312 | Umbilicus | Dermot Power | | R | Urza's Saga |
| 390 | Umbilicus | Dermot Power | | R | Dominaria Remastered |
| 52 | Umbra Mystic | Matt Stewart | White | R | Rise of the Eldrazi |
| 82 | Umbra Mystic | Matt Stewart | White | R | Wilds of Eldraine Commander |
| 48 | Umbra Stalker | Daarken | Black | R | Eventide |
| 89 | Umbral Juke | Bram Sels | Black | U | Strixhaven: School of Mages |
| 101 | Umbral Mantle | Richard Sardinha | | U | Mystery Booster 2: Convention Edition |
| 267 | Umbral Mantle | Richard Sardinha | | U | Shadowmoor |
| 38 | Umbris, Fear Manifest | Daarken | Blue/Black | M | Innistrad: Crimson Vow Commander |
| 76 | Umbris, Fear Manifest | Daarken | Blue/Black | M | Innistrad: Crimson Vow Commander |
| 111 | Umezawa's Charm | Eric Deschamps | Black | C | Modern Horizons |
| 14 | Umezawa's Jitte | Christopher Moeller | | M | From the Vault: Lore |
| 163 | Umezawa's Jitte | Christopher Moeller | | R | Betrayers of Kamigawa |
| 62 | Umori, the Collector | Daniel Warren Johnson | Black/Green | R | March of the Machine Multiverse Legends |
| 231 | Umori, the Collector | Jehan Choo | Black/Green | R | Ikoria: Lair of Behemoths |
| 78 | Unable to Scream | Fariba Khamseh | Blue | C | Duskmourn: House of Horror |
| 36 | Unassuming Gelatinous Serpent | Larissa Hasenheit, Mina Jeon, Daria Sergeyeva, Sam Burley | | C | Unfinity |
| 37 | Unassuming Sage | Michele Giorgi | White | C | Wilds of Eldraine |
| 74 | Unauthorized Exit | Andreas Zafiratos | Blue | C | Murders at Karlov Manor |
| 298 | Unauthorized Exit | Stephen Stark | Blue | C | Murders at Karlov Manor |
| 15 | Unbender Tine | Greg Hildebrandt | White/Blue | U | Alara Reborn |
| 97 | Unbender Tine | Greg Hildebrandt | White/Blue | U | Archenemy |
| 45 | Unblinking Bleb | Shishizaru | Blue | C | Future Sight |
| 82 | Unblinking Observer | Filip Burburan | Blue | C | Innistrad: Midnight Hunt |
| 189 | Unbound Flourishing | Tomasz Jedruszek | Green | M | Modern Horizons |
| 36 | Unbounded Potential | Iain McCaig | White | C | Modern Horizons 2 |
| 67 | Unbounded Potential | Iain McCaig | White | C | Commander Masters |
| 101 | Unbreakable Bond | Randy Vargas | Black | U | Ikoria: Lair of Behemoths |
| 29 | Unbreakable Formation | Matt Stewart | White | R | Ravnica Allegiance |
| 32 | Unbreakable Formation | Matt Stewart | White | R | Ravnica Remastered |
| 78 | Unbreakable Formation | Matt Stewart | White | R | The Brothers' War Commander |
| 95 | Unbreakable Formation | Matt Stewart | White | R | Innistrad: Midnight Hunt Commander |
| 106 | Unbreakable Formation | Matt Stewart | White | R | Dominaria United Commander |
| 179 | Unbreakable Formation | Ben Wootten | White | R | The Lord of the Rings: Tales of Middle Earth Commander |
| 213 | Unbreakable Formation | Matt Stewart | White | R | March of the Machine Commander |
| 388 | Unbreakable Formation | Matt Stewart | White | R | Commander Legends |
| 710 | Unbreakable Formation | Matt Stewart | White | R | Commander Legends: Battle for Baldur's Gate |
| 66 | Unbreathing Horde | Dave Kendall | Black | R | Duel Decks: Blessed vs. Cursed |
| 121 | Unbreathing Horde | Dave Kendall | Black | R | Innistrad |
| 126 | Unbridled Growth | Ryan Pancoast | Green | C | Aether Revolt |
| 184 | Unbridled Growth | Ryan Pancoast | Green | C | Kaladesh Remastered |
| 77 | Unburden | Wayne England | Black | C | Scourge |
| 114 | Unburden | Svetlin Velinov | Black | C | Amonkhet |
| 131 | Unburden | Svetlin Velinov | Black | C | Amonkhet Remastered |
| 14 | Unburial Rites | Ryan Pancoast | Black | U | Historic Anthology 3 |
| 36 | Unburial Rites | Ryan Pancoast | Black | U | Shadows of the Past |
| 85 | Unburial Rites | Ryan Pancoast | Black | U | Modern Masters 2017 Edition |
| 95 | Unburial Rites | Ryan Pancoast | Black | U | Double Masters 2022 |
| 111 | Unburial Rites | Ryan Pancoast | Black | U | Adventures in the Forgotten Realms Commander |
| 119 | Unburial Rites | Ryan Pancoast | Black | U | Ultimate Masters |
| 122 | Unburial Rites | Ryan Pancoast | Black | U | Innistrad |
| 139 | Unburial Rites | Ryan Pancoast | Black | U | Ikoria Commander |
| 137 | Uncage the Menagerie | Simon Dominic | Green | M | Hour of Devastation |
| 155 | Uncaged Fury | Jason Kang | Red | C | Masters 25 |
| 163 | Uncaged Fury | Jason Kang | Red | U | Core Set 2020 |
| 183 | Uncaged Fury | Jason Kang | Red | U | Shadows Over Innistrad Remastered |
| 188 | Uncaged Fury | Jason Kang | Red | C | Shadows over Innistrad |
| 163 | Uncanny Speed | Raymond Swanland | Red | C | Avacyn Restored |
| 164 | Unchained Berserker | Bram Sels | Red | U | Core Set 2020 |
| 261 | Uncharted Haven | Adam Paquette | | C | Bloomburrow |
| 281 | Uncharted Haven | Lorenzo Lanfranconi | | C | Kamigawa: Neon Dynasty |
| 564 | Uncharted Haven | Adam Paquette | | C | Magic: The Gathering Foundations |
| 53 | Uncharted Voyage | Julian Kok Joon Wen | Blue | C | Magic: The Gathering Foundations |
| 148 | Unchecked Growth | Tsutomu Kawade | Green | U | Betrayers of Kamigawa |
| 35 | Uncivil Unrest | Lorenzo Mastroianni | Red | R | March of the Machine Commander |
| 122 | Uncivil Unrest | Lorenzo Mastroianni | Red | R | March of the Machine Commander |
| 187 | Unclaimed Territory | Dimitar Marinski | | U | Innistrad: Midnight Hunt Commander |
| 188 | Unclaimed Territory | Dimitar Marinski | | U | Innistrad: Crimson Vow Commander |
| 258 | Unclaimed Territory | Dimitar | | U | Ixalan |
| 304 | Unclaimed Territory | Henry Peters | | U | Warhammer 40,000 Commander |
| 320 | Unclaimed Territory | Dimitar Marinski | | U | Ikoria Commander |
| 366 | Unclaimed Territory | Dimitar Marinski | | U | The Lost Caverns of Ixalan Commander |
| 399 | Unclaimed Territory | Dimitar Marinski | | U | Modern Horizons 3 Commander |
| 1050 | Unclaimed Territory | Dimitar Marinski | | U | Commander Masters |
| 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" |
| 82 | Uncomfortable Chill | Izzy | Blue | C | Core Set 2019 |
| 155 | Uncontrollable Anger | Kev Walker | Red | U | Magic: The Gathering—Conspiracy |
| 195 | Uncontrollable Anger | Matt Thompson | Red | C | Champions of Kamigawa |
| 244 | Uncontrollable Anger | Kev Walker | Red | C | Tenth Edition |
| 108 | Uncontrolled Infestation | Tony Szczudlo | Red | C | Scourge |
| 27 | Unconventional Tactics | Jason Felix | White | U | Hour of Devastation |
| 43 | Unconventional Tactics | Jason Felix | White | U | Amonkhet Remastered |
| 19 | Uncovered Clues | Jaime Jones | Blue | C | Dragon's Maze |
| 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 |
| 237 | Undead Sprinter | Nino Vecia | Black/Red | R | Duskmourn: House of Horror |
| 350 | Undead Sprinter | John Thacker | Black/Red | R | Duskmourn: House of Horror |
| 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 |
| 203 | Under the Skin | Fernando Falcone | Green | U | Duskmourn: House of Horror |
| 323 | Under the Skin | Cacho Rubione | Green | U | Duskmourn: House of Horror |
| 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 |
| 47 | Undercellar Sweep | Nino Is | White | U | Commander Legends: Battle for Baldur's Gate |
| 20 | Undercity | | | 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 |
| 83 | Undercity Plague | Vincent Proce | Black | R | Gatecrash |
| 15 | Undercity Plunder | Mirko Failoni | Black | R | Kamigawa: Neon Dynasty Alchemy |
| 88 | Undercity Scavenger | Tomasz Jedruszek | Black | C | Ravnica Allegiance |
| 126 | Undercity Scrounger | Mike Jordana | Black | C | Kamigawa: Neon Dynasty |
| 270 | Undercity Sewers | Yeong-Hao Han | | R | Murders at Karlov Manor |
| 332 | Undercity Sewers | Sergey Glushakov | | R | Murders at Karlov Manor |
| 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 |
| 25 | Undercity Upheaval | Grady Frederick | Green | U | March of the Machine: The Aftermath |
| 75 | Undercity Upheaval | Julie Dillon | Green | U | March of the Machine: The Aftermath |
| 125 | Undercity Upheaval | Grady Frederick | Green | U | March of the Machine: The Aftermath |
| 205 | Undercity Upheaval | Julie Dillon | Green | U | March of the Machine: The Aftermath |
| 210 | Undercity Uprising | Magali Villeneuve | Black/Green | C | Guilds of Ravnica |
| 89 | Undercity's Embrace | Tyler Walpole | Black | C | Ravnica Allegiance |
| 96 | Undercity's Embrace | Tyler Walpole | Black | C | Ravnica Remastered |
| 620 | Under-Construction Skyscraper (playtest) | Kevin Dubell | | R | Mystery Booster 2: Convention Edition |
| 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 |
| 62 | Underdark Rift | Chris Ostrowski | | U | Adventures in the Forgotten Realms Commander |
| 86 | Underdome | Matt Gaser | | C | Unsanctioned |
| 271 | Underground Mortuary | Sergey Glushakov | | R | Murders at Karlov Manor |
| 333 | Underground Mortuary | Sergey Glushakov | | R | Murders at Karlov Manor |
| Underground River | Jeff Miracola | | R | Fifth Edition |
| Underground River | NéNé Thomas | | R | Ice Age |
| 267 | Underground River | Volkan Baga | | R | The Brothers' War |
| 275 | Underground River | Andrew Goldhawk | | R | Commander Anthology 2018 |
| 300 | Underground River | Rob Alexander | | R | The Brothers' War |
| 321 | Underground River | Volkan Baga | | R | Duskmourn: House of Horror Commander |
| 326 | Underground River | Andrew Goldhawk | | R | Ninth Edition |
| 330 | Underground River | Jeff Miracola | | R | Classic Sixth Edition |
| 335 | Underground River | Andrew Goldhawk | | R | Commander 2016 |
| 338 | Underground River | Volkan Baga | | R | Outlaws of Thunder Junction Commander |
| 342 | Underground River | Logan Feliciano | | R | The Lord of the Rings: Tales of Middle Earth Commander |
| 350 | Underground River | Andrew Goldhawk | | R | Seventh Edition |
| 362 | Underground River | Andrew Goldhawk | | R | Tenth Edition |
| 400 | Underground River | Volkan Baga | | R | Modern Horizons 3 Commander |
| Underground Sea | Rob Alexander | | R | Revised Edition |
| Underground Sea | Rob Alexander | | R | Unlimited Edition |
| Underground Sea | Rob Alexander | | R | Limited Edition Beta |
| Underground Sea | Rob Alexander | | R | Limited Edition Alpha |
| 240 | Underground Sea | Rob Alexander | | R | Masters Edition II |
| 256 | Underground Sea | Rob Alexander | | R | Masters Edition IV |
| 323 | Underground Sea | Cliff Childs | | R | Vintage Masters |
| Undergrowth | Pat Morrissey | Green | C | Alliances |
| Undergrowth | Pat Morrissey | Green | C | Alliances |
| 197 | Undergrowth Champion | Tyler Jacobson | Green | M | Battle for Zendikar |
| 181 | Undergrowth Recon | Ryan Pancoast | Green | M | Murders at Karlov Manor |
| 411 | Undergrowth Recon | Ryan Pancoast | Green | M | Murders at Karlov Manor |
| 204 | Undergrowth Scavenger | Nils Hamm | Green | C | Magic 2015 Core Set |