| 4+ | Unexpectedly Absent | MTGCommander2020_106 |
| 4+ | Unexplained Absence | MTGMKC_017 |
| 4+ | Unexplained Disappearance | MTGGuilds of Ravnica_056 |
| 4+ | Unexplained Vision | MTGThrone of Eldraine_070 |
| 4+ | Unflinching Courage | MTGDragonsMaze_111 |
| 2 | Unflinching Courage | MTGCommander2018_192 |
| 1 | Unflinching Courage | MTGBattlebond_230 |
| 1 | Unflinching Courage (FOIL) | MTGDragonsMaze_111F |
| 4+ | Unforge | MTGDarksteel_071 |
| 3 | Unforge Foil | MTGDarksteel_071F |
| 4+ | Unforgiving One | MTGNEO_127 |
| 2 | Unforgiving One (Foil) | MTGNEO_127F |
| 4+ | Unfriendly Fire | MTGIxalan_172 |
| 4+ | Unfulfilled Desires | MTGMIR_285 |
| 4+ | Unhallowed Pact | MTGConspiracy_131 |
| 4+ | Unhinge | MTGTorment_087 |
| 1 | Unhinge Foil | MTGTorment_087F |
| 3 | Unholy Citadel | MTGLEG_309 |
| 1 | Unholy Grotto | MTGOnslaught_327 |
| 1 | Unholy Grotto | MTGTheList_577 |
| 3 | Unholy Hunger | MTGMagicOrigins_125 |
| 1 | Unholy Hunger | MTGUltimateMasters_120 |
| 4+ | Unholy Indenture | MTGCore Set 2020_119 |
| 4+ | Unholy Strength | MTG8ED_169 |
| 1 | Unholy Strength | MTG4ED_166 |
| 1 | Unholy Strength | MTG3ED_133 |
| 4+ | Unholy Strength | MTGMagic2010_116 |
| 4+ | Unholy Strength | MTGMagic2011_119 |
| 4+ | Unholy Strength | MTGDDDivine_047 |
| 4+ | Unified Strike | MTGOnslaught_058 |
|
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