| Unholy StrengthSummer Magic / Edgar · 133 | Summer Magic / Edgar | 133 | Common | €379.81 |
| Unicycling AutomatonUnknown Event · CA03 | Unknown Event | CA03 | Common | — |
| Unified LungeFace the Hydra Tokens · 15 | Face the Hydra Tokens | 15 | Common | $0.42 |
| Unified StrikeOnslaught · 58 | Onslaught | 58 | Common | €0.10 |
| Union of the Third PathThe Brothers' War · 31 | The Brothers' War | 31 | Common | €0.19 |
| Unique Charmed PantsUnfinity Sticker Sheets · 38 | Unfinity Sticker Sheets | 38 | Common | €0.18 |
| UNIT HeadquartersDoctor Who · 604 | Doctor Who | 604 | Common | €0.21 |
| Universal AutomatonJumpstart 2022 · 803 | Jumpstart 2022 | 803 | Common | €0.42 |
| Universal AutomatonModern Horizons · 235 | Modern Horizons | 235 | Common | €0.39 |
| Universal AutomatonThe List Tokens · MH1-235 | The List Tokens | MH1-235 | Common | €0.37 |
| Universal AutomatonThe List Tokens · J22-803 | The List Tokens | J22-803 | Common | €0.54 |
| Universal AutomatonJumpstart: Historic Horizons · 759 | Jumpstart: Historic Horizons | 759 | Common | — |
| Universal SolventAether Revolt · 178 | Aether Revolt | 178 | Common | €0.02 |
| Universal SolventCommander Legends: Battle for Baldur's Gate · 342 | Commander Legends: Battle for Baldur's Gate | 342 | Common | €0.10 |
| Universal SolventCommander Legends · 347 | Commander Legends | 347 | Common | €0.03 |
| Universal SolventFoundations Jumpstart · 761 | Foundations Jumpstart | 761 | Common | €0.12 |
| Universal SolventJumpstart 2022 · 804 | Jumpstart 2022 | 804 | Common | €0.09 |
| Universal SolventThe List Tokens · AER-178 | The List Tokens | AER-178 | Common | €0.07 |
| Universal SolventKaladesh Remastered · 273 | Kaladesh Remastered | 273 | Common | — |
| University CampusMarvel's Spider-Man · 186 | Marvel's Spider-Man | 186 | Common | €0.12 |
| University CampusThrough the Omenpaths · 186 | Through the Omenpaths | 186 | Common | — |
| Unknown EventBlack Lotus Unknown Planechase · PLA010 | Black Lotus Unknown Planechase | PLA010 | Common | — |
| Unknown Event ShoresUnknown Event · CL01b | Unknown Event | CL01b | Common | $4.99 |
| Unknown ShoresOath of the Gatewatch · 181 | Oath of the Gatewatch | 181 | Common | €0.07 |
| Unknown ShoresTheros Beyond Death · 249 | Theros Beyond Death | 249 | Common | €0.06 |
| Unknown ShoresTheros · 229 | Theros | 229 | Common | €0.07 |
| Unknown ShoresIxalan · 259 | Ixalan | 259 | Common | €0.10 |
| Unlawful EntryUnfinity · 62 | Unfinity | 62 | Common | $0.03 |
| Unlawful EntryUnfinity · 348 | Unfinity | 348 | Common | $0.29 |
| Unleash ShellThe Brothers' War · 155 | The Brothers' War | 155 | Common | €0.03 |
| Unleash the FluxDoctor Who · 605 | Doctor Who | 605 | Common | €0.24 |
| Unlikely AidIkoria: Lair of Behemoths · 103 | Ikoria: Lair of Behemoths | 103 | Common | €0.06 |
| Unlikely AidWar of the Spark · 109 | War of the Spark | 109 | Common | €0.07 |
| Unlikely AidArena Beginner Set · 64 | Arena Beginner Set | 64 | Common | — |
| Unliving LegionnaireMarvel Super Heroes · 119 | Marvel Super Heroes | 119 | Common | €0.06 |
| Unlucky DropThe Lost Caverns of Ixalan · 82 | The Lost Caverns of Ixalan | 82 | Common | €0.02 |
| UnmakeArchenemy · 98 | Archenemy | 98 | Common | $0.77 |
| UnmakeDuel Decks: Sorin vs. Tibalt · 27 | Duel Decks: Sorin vs. Tibalt | 27 | Common | €0.39 |
| UnmakeEventide · 96 | Eventide | 96 | Common | $0.31 |
| UnmakeThe List Tokens · EVE-96 | The List Tokens | EVE-96 | Common | $0.16 |
| UnmakeMagic Online Promos · 32551 | Magic Online Promos | 32551 | Common | — |
| Unmake the GravesMagic 2015 · 120 | Magic 2015 | 120 | Common | €0.06 |
| Unnatural AggressionBattle for Zendikar · 168 | Battle for Zendikar | 168 | Common | €0.05 |
| Unnatural AggressionJumpstart 2022 · 737 | Jumpstart 2022 | 737 | Common | €0.11 |
| Unnatural EnduranceOath of the Gatewatch · 80 | Oath of the Gatewatch | 80 | Common | $0.07 |
| Unnatural PredationMirrodin Besieged · 93 | Mirrodin Besieged | 93 | Common | $0.09 |
| Unnatural SpeedChampions of Kamigawa · 197 | Champions of Kamigawa | 197 | Common | €0.08 |
| UnnerveBattle Royale Box Set · 91 | Battle Royale Box Set | 91 | Common | $0.40 |
| UnnerveCommander Anthology Volume II · 81 | Commander Anthology Volume II | 81 | Common | €0.21 |
| UnnerveCommander 2011 · 105 | Commander 2011 | 105 | Common | €0.19 |