| Unidentified HovershipDuskmourn: House of Horror Promos · 37s | Duskmourn: House of Horror Promos | 37s | Rare | $0.47 |
| Unifying TheoryOdyssey · 112 | Odyssey | 112 | Rare | €0.41 |
| United BattlefrontTarkir: Dragonstorm Promos · 32p | Tarkir: Dragonstorm Promos | 32p | Rare | €0.25 |
| United BattlefrontTarkir: Dragonstorm Promos · 32s | Tarkir: Dragonstorm Promos | 32s | Rare | €0.77 |
| United BattlefrontTarkir: Dragonstorm · 32 | Tarkir: Dragonstorm | 32 | Rare | €0.22 |
| United BattlefrontTarkir: Dragonstorm · 330 | Tarkir: Dragonstorm | 330 | Rare | $0.28 |
| Unite the CoalitionDominaria United Commander · 15 | Dominaria United Commander | 15 | Rare | €0.09 |
| Unite the CoalitionDominaria United Commander · 91 | Dominaria United Commander | 91 | Rare | €0.39 |
| Universal AutomatonMagic Online Promos · 91381 | Magic Online Promos | 91381 | Rare | — |
| Universal SurveillanceEdge of Eternities Commander · 81 | Edge of Eternities Commander | 81 | Rare | €0.20 |
| Universal SurveillanceNeon Dynasty Commander · 17 | Neon Dynasty Commander | 17 | Rare | $0.24 |
| Universal SurveillanceNeon Dynasty Commander · 54 | Neon Dynasty Commander | 54 | Rare | €0.33 |
| Universal SurveillanceMagic Online Promos · 97935 | Magic Online Promos | 97935 | Rare | — |
| Unleash FurySecret Lair Drop Tokens · 7050 | Secret Lair Drop Tokens | 7050 | Rare | $1.47 |
| Unleash the InfernoStreets of New Capenna Promos · 229p | Streets of New Capenna Promos | 229p | Rare | €0.19 |
| Unleash the InfernoStreets of New Capenna Promos · 229s | Streets of New Capenna Promos | 229s | Rare | €0.27 |
| Unleash the InfernoStreets of New Capenna · 229 | Streets of New Capenna | 229 | Rare | €0.14 |
| Unleash the InfernoStreets of New Capenna · 337 | Streets of New Capenna | 337 | Rare | €0.17 |
| Unleash the InfernoStreets of New Capenna · 402 | Streets of New Capenna | 402 | Rare | €0.17 |
| Unlicensed DisintegrationFriday Night Magic 2017 Tokens · 5 | Friday Night Magic 2017 Tokens | 5 | Rare | €0.10 |
| Unlicensed HearseBreaking News · 64 | Breaking News | 64 | Rare | $0.42 |
| Unlicensed HearseStreets of New Capenna Promos · 246p | Streets of New Capenna Promos | 246p | Rare | $0.70 |
| Unlicensed HearseStreets of New Capenna Promos · 246s | Streets of New Capenna Promos | 246s | Rare | €2.09 |
| Unlicensed HearseStreets of New Capenna · 246 | Streets of New Capenna | 246 | Rare | $0.29 |
| Unlicensed HearseStreets of New Capenna · 440 | Streets of New Capenna | 440 | Rare | $0.62 |
| Unlicensed HearseSecret Lair Drop Tokens · 1772 | Secret Lair Drop Tokens | 1772 | Rare | $3.49 |
| Unlicensed HearseMagic Online Promos · 99725 | Magic Online Promos | 99725 | Rare | — |
| Unliving PsychopathDissension · 56 | Dissension | 56 | Rare | €0.23 |
| Unlucky Cabbage MerchantWizards Play Network 2025 · 15 | Wizards Play Network 2025 | 15 | Rare | $0.41 |
| UnmakeMagic Player Rewards 2009 · 3 | Magic Player Rewards 2009 | 3 | Rare | €1.17 |
| Unmarked GraveModern Horizons 2 · 106 | Modern Horizons 2 | 106 | Rare | €2.78 |
| Unmarked GraveModern Horizons 2 · 453 | Modern Horizons 2 | 453 | Rare | €2.94 |
| Unmarked GraveModern Horizons 2 Promos · 106p | Modern Horizons 2 Promos | 106p | Rare | €2.51 |
| Unmarked GraveModern Horizons 2 Promos · 106s | Modern Horizons 2 Promos | 106s | Rare | €4.31 |
| Unmarked GraveMagic Online Promos · 91263 | Magic Online Promos | 91263 | Rare | — |
| UnmaskMercadian Masques · 168 | Mercadian Masques | 168 | Rare | €22.34 |
| UnmaskSecret Lair Drop Tokens · 413 | Secret Lair Drop Tokens | 413 | Rare | $6.25 |
| UnmaskThe List Tokens · MMQ-168 | The List Tokens | MMQ-168 | Rare | $9.75 |
| Unmoored EgoGuilds of Ravnica · 212 | Guilds of Ravnica | 212 | Rare | €0.19 |
| Unmoored EgoGuilds of Ravnica Promos · 212p | Guilds of Ravnica Promos | 212p | Rare | €0.25 |
| Unnatural GrowthBloomburrow Commander · 245 | Bloomburrow Commander | 245 | Rare | €2.34 |
| Unnatural GrowthInnistrad: Double Feature · 206 | Innistrad: Double Feature | 206 | Rare | €2.27 |
| Unnatural GrowthInnistrad Remastered · 223 | Innistrad Remastered | 223 | Rare | €1.71 |
| Unnatural GrowthInnistrad: Midnight Hunt · 206 | Innistrad: Midnight Hunt | 206 | Rare | €1.87 |
| Unnatural GrowthInnistrad: Midnight Hunt · 365 | Innistrad: Midnight Hunt | 365 | Rare | €2.61 |
| Unnatural GrowthInnistrad: Midnight Hunt Promos · 206p | Innistrad: Midnight Hunt Promos | 206p | Rare | €2.22 |
| Unnatural GrowthInnistrad: Midnight Hunt Promos · 206s | Innistrad: Midnight Hunt Promos | 206s | Rare | €3.46 |
| Unnatural GrowthSecret Lair Drop Tokens · 865 | Secret Lair Drop Tokens | 865 | Rare | €3.65 |
| Unnatural GrowthWilds of Eldraine: Enchanting Tales · 62 | Wilds of Eldraine: Enchanting Tales | 62 | Rare | €2.60 |
| Unnatural GrowthMagic Online Promos · 94038 | Magic Online Promos | 94038 | Rare | — |