| Unbreakable FormationSecret Lair Drop Tokens · 7052 | Secret Lair Drop Tokens | 7052 | Rare | $1.36 |
| Unbreakable RemnantAlchemy: Secrets of Strixhaven · 2 | Alchemy: Secrets of Strixhaven | 2 | Uncommon | — |
| Unbreathing HordeDuel Decks: Blessed vs. Cursed Tokens · 66 | Duel Decks: Blessed vs. Cursed Tokens | 66 | Rare | $0.41 |
| Unbreathing HordeInnistrad · 121 | Innistrad | 121 | Rare | $0.42 |
| Unbreathing HordeStarter Commander Decks · 113 | Starter Commander Decks | 113 | Rare | $0.27 |
| Unbridled GrowthAether Revolt · 126 | Aether Revolt | 126 | Common | €0.17 |
| Unbridled GrowthKaladesh Remastered · 184 | Kaladesh Remastered | 184 | Common | — |
| UnburdenAmonkhet · 114 | Amonkhet | 114 | Common | $0.05 |
| UnburdenScourge · 77 | Scourge | 77 | Common | €0.04 |
| UnburdenThe List Tokens · AKH-114 | The List Tokens | AKH-114 | Common | $0.10 |
| UnburdenAmonkhet Remastered · 131 | Amonkhet Remastered | 131 | Common | — |
| Unburial RitesDouble Masters 2022 · 95 | Double Masters 2022 | 95 | Uncommon | €0.25 |
| Unburial RitesForgotten Realms Commander · 111 | Forgotten Realms Commander | 111 | Uncommon | €0.18 |
| Unburial RitesCommander 2020 · 139 | Commander 2020 | 139 | Uncommon | €0.18 |
| Unburial RitesInnistrad · 122 | Innistrad | 122 | Uncommon | €0.06 |
| Unburial RitesModern Masters 2017 · 85 | Modern Masters 2017 | 85 | Uncommon | €0.19 |
| Unburial RitesThe List Tokens · ISD-122 | The List Tokens | ISD-122 | Uncommon | €0.17 |
| Unburial RitesUltimate Masters · 119 | Ultimate Masters | 119 | Uncommon | €0.16 |
| Unburial RitesHistoric Anthology 3 · 14 | Historic Anthology 3 | 14 | Uncommon | — |
| Unburial RitesShadows of the Past · 36 | Shadows of the Past | 36 | Uncommon | — |
| Unburied EarthcarverTarkir: Dragonstorm · 95 | Tarkir: Dragonstorm | 95 | Common | €0.07 |
| UnburyLorwyn Eclipsed · 123 | Lorwyn Eclipsed | 123 | Uncommon | €0.10 |
| Uncaged FuryMasters 25 · 155 | Masters 25 | 155 | Common | €0.12 |
| Uncaged FuryInnistrad Remastered · 177 | Innistrad Remastered | 177 | Uncommon | €0.09 |
| Uncaged FuryFoundations Jumpstart · 607 | Foundations Jumpstart | 607 | Uncommon | €0.08 |
| Uncaged FuryCore Set 2020 · 163 | Core Set 2020 | 163 | Uncommon | €0.04 |
| Uncaged FuryShadows over Innistrad · 188 | Shadows over Innistrad | 188 | Common | €0.02 |
| Uncaged FuryThe List Tokens · A25-155 | The List Tokens | A25-155 | Common | €0.10 |
| Uncaged FuryShadows over Innistrad Remastered · 183 | Shadows over Innistrad Remastered | 183 | Uncommon | — |
| Uncage the MenagerieHour of Devastation · 137 | Hour of Devastation | 137 | Mythic Rare | $0.86 |
| Uncage the MenagerieHour of Devastation Promos · 137s | Hour of Devastation Promos | 137s | Mythic Rare | €2.69 |
| UncannyMarvel Super Heroes Jumpstart Front Cards · 59 | Marvel Super Heroes Jumpstart Front Cards | 59 | — | — |
| Uncanny SpeedAvacyn Restored · 163 | Avacyn Restored | 163 | Common | €0.05 |
| Unchained BerserkerCore Set 2020 · 164 | Core Set 2020 | 164 | Uncommon | €0.08 |
| Unchained BerserkerThe List Tokens · M20-164 | The List Tokens | M20-164 | Uncommon | $0.10 |
| Uncharted HavenBloomburrow · 261 | Bloomburrow | 261 | Common | €0.05 |
| Uncharted HavenFoundations · 564 | Foundations | 564 | Common | $0.09 |
| Uncharted HavenKamigawa: Neon Dynasty · 281 | Kamigawa: Neon Dynasty | 281 | Common | €0.09 |
| Uncharted VoyageFoundations · 53 | Foundations | 53 | Common | €0.06 |
| Unchecked GrowthBetrayers of Kamigawa · 148 | Betrayers of Kamigawa | 148 | Uncommon | €0.07 |
| Uncivil UnrestMarch of the Machine Commander · 35 | March of the Machine Commander | 35 | Rare | €17.22 |
| Uncivil UnrestMarch of the Machine Commander · 122 | March of the Machine Commander | 122 | Rare | €13.29 |
| Uncivil UnrestSecret Lair Drop Tokens · 2008 | Secret Lair Drop Tokens | 2008 | Rare | $18.93 |
| Unclaimed Battle AxeUnknown Event · UR02c | Unknown Event | UR02c | Uncommon | — |
| Unclaimed BirdUnknown Event · CU04 | Unknown Event | CU04 | Common | — |
| Unclaimed BlessingUnknown Event · CB11 | Unknown Event | CB11 | Common | — |
| Unclaimed CatUnknown Event · CW02 | Unknown Event | CW02 | Common | — |
| Unclaimed TanadonUnknown Event · CG07 | Unknown Event | CG07 | Common | — |
| Unclaimed TerritoryWarhammer 40,000 Commander · 304 | Warhammer 40,000 Commander | 304 | Uncommon | €0.82 |
| Unclaimed TerritoryWarhammer 40,000 Commander · 304★ | Warhammer 40,000 Commander | 304★ | Uncommon | $8.01 |