| Kher KeepTime Spiral Remastered · 281 | Time Spiral Remastered | 281 | Rare | €0.25 |
| Kher KeepReality Fracture Commander · 75 | Reality Fracture Commander | 75 | Rare | €0.16 |
| Kheru Lich LordKhans of Tarkir · 182 | Khans of Tarkir | 182 | Rare | €0.13 |
| Kheru Lich LordKhans of Tarkir Promos · 182s | Khans of Tarkir Promos | 182s | Rare | €0.30 |
| Kheru Mind-EaterCommander 2017 · 17 | Commander 2017 | 17 | Rare | $0.61 |
| Kheru Mind-EaterTreasure Chest · 65761 | Treasure Chest | 65761 | Rare | — |
| Kheru SpellsnatcherCommander 2019 · 89 | Commander 2019 | 89 | Rare | €0.10 |
| Kheru SpellsnatcherDuskmourn: House of Horror Commander · 119 | Duskmourn: House of Horror Commander | 119 | Rare | €0.12 |
| Kheru SpellsnatcherKhans of Tarkir · 45 | Khans of Tarkir | 45 | Rare | €0.19 |
| Kheru SpellsnatcherKhans of Tarkir · 45y | Khans of Tarkir | 45y | Rare | — |
| Khod, Etlan Shiis EnvoyMystery Booster Playtest Cards 2019 · 24 | Mystery Booster Playtest Cards 2019 | 24 | Rare | $0.45 |
| Khod, Etlan Shiis EnvoyMystery Booster Playtest Cards 2021 · 24 | Mystery Booster Playtest Cards 2021 | 24 | Rare | €0.32 |
| Khorvath BrightflameBattlebond · 9 | Battlebond | 9 | Rare | €0.34 |
| Khorvath BrightflameBattlebond Promos · 9s | Battlebond Promos | 9s | Rare | €1.76 |
| Khorvath's FuryBattlebond · 59 | Battlebond | 59 | Rare | €2.05 |
| Kianne, Dean of Substance // Imbraham, Dean of TheoryStrixhaven: School of Mages Promos · 152s | Strixhaven: School of Mages Promos | 152s | Rare | $0.20 |
| Kianne, Dean of Substance // Imbraham, Dean of TheoryStrixhaven: School of Mages · 152 | Strixhaven: School of Mages | 152 | Rare | €0.10 |
| Kianne, Dean of Substance // Imbraham, Dean of TheoryStrixhaven: School of Mages · 326 | Strixhaven: School of Mages | 326 | Rare | €0.24 |
| Kianne, Dean of Substance // Imbraham, Dean of TheoryMagic Online Promos · 90244 | Magic Online Promos | 90244 | Rare | — |
| Kiki-Jiki, Mirror BreakerChampions of Kamigawa · 175 | Champions of Kamigawa | 175 | Rare | €7.79 |
| Kiki-Jiki, Mirror BreakerThe List Tokens · CHK-175 | The List Tokens | CHK-175 | Rare | €9.16 |
| Kiku, Night's FlowerChampions of Kamigawa · 121 | Champions of Kamigawa | 121 | Rare | €1.40 |
| Kíli the ResourcefulThe Hobbit · 17 | The Hobbit | 17 | Rare | €1.23 |
| Kíli the ResourcefulThe Hobbit · 287 | The Hobbit | 287 | Rare | €1.69 |
| Killer BeesLegends · 192 | Legends | 192 | Rare | €40.39 |
| Killer InstinctGuildpact · 120 | Guildpact | 120 | Rare | €0.22 |
| Killer ServiceMurders at Karlov Manor Commander · 174 | Murders at Karlov Manor Commander | 174 | Rare | €0.27 |
| Killer ServiceNew Capenna Commander · 61 | New Capenna Commander | 61 | Rare | €0.25 |
| Killer ServiceNew Capenna Commander · 161 | New Capenna Commander | 161 | Rare | €0.85 |
| Killer ServiceNew Capenna Commander Promos · 61p | New Capenna Commander Promos | 61p | Rare | €1.20 |
| Killer ServiceMagic Online Promos · 99845 | Magic Online Promos | 99845 | Rare | — |
| Killing WaveAvacyn Restored · 111 | Avacyn Restored | 111 | Rare | $0.54 |
| Killing WaveAvacyn Restored Promos · 111 | Avacyn Restored Promos | 111 | Rare | €4.54 |
| Killing WaveMagic Online Promos · 44319 | Magic Online Promos | 44319 | Rare | — |
| Kill! Maim! Burn!Warhammer 40,000 Commander · 128 | Warhammer 40,000 Commander | 128 | Rare | €0.24 |
| Kill! Maim! Burn!Warhammer 40,000 Commander · 128★ | Warhammer 40,000 Commander | 128★ | Rare | $0.90 |
| Killmonger, Ruthless UsurperMarvel Super Heroes Commander · 53 | Marvel Super Heroes Commander | 53 | Rare | $0.27 |
| Killmonger, Ruthless UsurperMarvel Super Heroes Commander · 364 | Marvel Super Heroes Commander | 364 | Rare | $1.19 |
| Kill SwitchNemesis · 133 | Nemesis | 133 | Rare | €3.30 |
| Kilnmouth DragonArchenemy · 44 | Archenemy | 44 | Rare | $0.67 |
| Kilnmouth DragonDuel Decks: Knights vs. Dragons · 59 | Duel Decks: Knights vs. Dragons | 59 | Rare | €0.41 |
| Kilnmouth DragonLegions · 104 | Legions | 104 | Rare | €0.95 |
| Kilnmouth DragonThe List Tokens · DDG-59 | The List Tokens | DDG-59 | Rare | €0.95 |
| Kimahri, Valiant GuardianFinal Fantasy Commander · 85 | Final Fantasy Commander | 85 | Rare | €0.17 |
| Kimahri, Valiant GuardianFinal Fantasy Commander · 175 | Final Fantasy Commander | 175 | Rare | $0.40 |
| Kimoyo BeadsMarvel Super Heroes Commander · 109 | Marvel Super Heroes Commander | 109 | Rare | €0.16 |
| Kimoyo BeadsMarvel Super Heroes Commander · 440 | Marvel Super Heroes Commander | 440 | Rare | €0.59 |
| KinbindingLorwyn Eclipsed · 20 | Lorwyn Eclipsed | 20 | Rare | €0.23 |
| KinbindingLorwyn Eclipsed · 299 | Lorwyn Eclipsed | 299 | Rare | $0.43 |
| KinbindingLorwyn Eclipsed · 407 | Lorwyn Eclipsed | 407 | Rare | $0.25 |