| Unnatural GrowthFoundations Commander · 238 | Foundations Commander | 238 | Rare | $1.49 |
| Unnatural GrowthSecret Lair Drop Tokens · 2599 | Secret Lair Drop Tokens | 2599 | Rare | $4.62 |
| Unnatural HungerMercadian Masques · 169 | Mercadian Masques | 169 | Rare | €0.40 |
| Unnatural SelectionApocalypse · 32 | Apocalypse | 32 | Rare | €1.60 |
| Unnatural SelectionMystery Booster 2 Tokens · 38 | Mystery Booster 2 Tokens | 38 | Rare | $0.19 |
| Unnatural SummonsAlchemy: Duskmourn · 27 | Alchemy: Duskmourn | 27 | Rare | — |
| Unpredictable CycloneIkoria: Lair of Behemoths · 139 | Ikoria: Lair of Behemoths | 139 | Rare | €0.12 |
| Unpredictable CycloneIkoria: Lair of Behemoths · 325 | Ikoria: Lair of Behemoths | 325 | Rare | €0.34 |
| Unpredictable CycloneIkoria: Lair of Behemoths Promos · 139p | Ikoria: Lair of Behemoths Promos | 139p | Rare | €0.19 |
| Unpredictable CycloneIkoria: Lair of Behemoths Promos · 139s | Ikoria: Lair of Behemoths Promos | 139s | Rare | €0.02 |
| Unpredictable CycloneMagic Online Promos · 80885 | Magic Online Promos | 80885 | Rare | — |
| Unquenchable FuryNeon Dynasty Commander · 23 | Neon Dynasty Commander | 23 | Rare | €0.15 |
| Unquenchable FuryNeon Dynasty Commander · 63 | Neon Dynasty Commander | 63 | Rare | €0.10 |
| Unruly KrasisRavnica: Clue Edition · 50 | Ravnica: Clue Edition | 50 | Rare | €0.35 |
| Unscythe, Killer of KingsAlara Reborn · 114 | Alara Reborn | 114 | Rare | €0.92 |
| Unsettled MarinerModern Horizons · 216 | Modern Horizons | 216 | Rare | $3.10 |
| Unsettled MarinerThe List Tokens · MH1-216 | The List Tokens | MH1-216 | Rare | $5.10 |
| Unshakable TailMurders at Karlov Manor Commander · 29 | Murders at Karlov Manor Commander | 29 | Rare | €0.27 |
| Unshakable TailMurders at Karlov Manor Commander · 339 | Murders at Karlov Manor Commander | 339 | Rare | €0.40 |
| Unstable Glyphbridge // Sandswirl WanderglyphThe Lost Caverns of Ixalan · 41 | The Lost Caverns of Ixalan | 41 | Rare | €0.28 |
| Unstable Glyphbridge // Sandswirl WanderglyphThe Lost Caverns of Ixalan · 358 | The Lost Caverns of Ixalan | 358 | Rare | €0.32 |
| Unstable HulkLegions · 115 | Legions | 115 | Rare | €0.16 |
| Unstable Molecule SuitMarvel Super Heroes Commander · 116 | Marvel Super Heroes Commander | 116 | Rare | €1.02 |
| Unstable Molecule SuitMarvel Super Heroes Commander · 457 | Marvel Super Heroes Commander | 457 | Rare | €2.95 |
| Unstable ShapeshifterTempest · 100 | Tempest | 100 | Rare | €0.45 |
| Unstoppable AshMorningtide · 137 | Morningtide | 137 | Rare | €0.49 |
| Unstoppable AshThe List Tokens · MOR-137 | The List Tokens | MOR-137 | Rare | $2.50 |
| Unstoppable PlanAetherdrift · 72 | Aetherdrift | 72 | Rare | $1.45 |
| Unstoppable PlanAetherdrift · 382 | Aetherdrift | 382 | Rare | €2.13 |
| Unstoppable PlanAetherdrift · 442 | Aetherdrift | 442 | Rare | €5.07 |
| Unstoppable PlanAetherdrift Promos · 72p | Aetherdrift Promos | 72p | Rare | €1.55 |
| Unstoppable PlanAetherdrift Promos · 72s | Aetherdrift Promos | 72s | Rare | €2.57 |
| Unstoppable SlasherDuskmourn: House of Horror · 119 | Duskmourn: House of Horror | 119 | Rare | €3.39 |
| Unstoppable SlasherDuskmourn: House of Horror · 294 | Duskmourn: House of Horror | 294 | Rare | €4.21 |
| Unstoppable SlasherDuskmourn: House of Horror · 312 | Duskmourn: House of Horror | 312 | Rare | €3.31 |
| Unstoppable SlasherDuskmourn: House of Horror Promos · 119p | Duskmourn: House of Horror Promos | 119p | Rare | €2.55 |
| Unstoppable SlasherDuskmourn: House of Horror Promos · 119s | Duskmourn: House of Horror Promos | 119s | Rare | €4.93 |
| Unstoppable SlasherJapan Standard Cup · 2026-2 | Japan Standard Cup | 2026-2 | Rare | €4.00 |
| UnsubstantiateMagic Online Promos · 61557 | Magic Online Promos | 61557 | Rare | — |
| Untaidake, the Cloud KeeperChampions of Kamigawa · 285 | Champions of Kamigawa | 285 | Rare | €1.79 |
| Untap, Upkeep, DrawUnknown Event · RU12 | Unknown Event | RU12 | Rare | — |
| Unwinding ClockThe Brothers' War Retro Artifacts · 61 | The Brothers' War Retro Artifacts | 61 | Rare | €14.87 |
| Unwinding ClockThe Brothers' War Retro Artifacts · 124 | The Brothers' War Retro Artifacts | 124 | Rare | €16.35 |
| Unwinding ClockThe Brothers' War Retro Artifacts · 124z | The Brothers' War Retro Artifacts | 124z | Rare | €161.59 |
| Unwinding ClockCommander 2018 · 228 | Commander 2018 | 228 | Rare | €11.78 |
| Unwinding ClockNew Phyrexia · 164 | New Phyrexia | 164 | Rare | €14.74 |
| Unwinding ClockThe List Tokens · NPH-164 | The List Tokens | NPH-164 | Rare | €8.00 |
| Unyaro BeesTime Spiral · 231 | Time Spiral | 231 | Rare | €0.15 |
| Unyielding GatekeeperMurders at Karlov Manor · 35 | Murders at Karlov Manor | 35 | Rare | $0.12 |
| Unyielding GatekeeperMurders at Karlov Manor · 392 | Murders at Karlov Manor | 392 | Rare | €0.15 |