| Kolaghan, the Storm's FuryFate Reforged · 155 | Fate Reforged | 155 | Rare | €0.56 |
| Kolaghan, the Storm's FuryFate Reforged Promos · 155s | Fate Reforged Promos | 155s | Rare | €1.05 |
| Kolodin, Triumph CasterAetherdrift · 210 | Aetherdrift | 210 | Rare | €0.14 |
| Kolodin, Triumph CasterAetherdrift · 364 | Aetherdrift | 364 | Rare | €0.18 |
| Kolodin, Triumph CasterAetherdrift · 483 | Aetherdrift | 483 | Rare | €1.39 |
| Kolodin, Triumph CasterAetherdrift Promos · 210p | Aetherdrift Promos | 210p | Rare | €0.08 |
| Kolodin, Triumph CasterAetherdrift Promos · 210s | Aetherdrift Promos | 210s | Rare | $0.44 |
| Kolvori, God of Kinship // The Ringhart CrestKaldheim · 181 | Kaldheim | 181 | Rare | €0.21 |
| Kolvori, God of Kinship // The Ringhart CrestKaldheim · 318 | Kaldheim | 318 | Rare | €0.32 |
| Kolvori, God of Kinship // The Ringhart CrestKaldheim Promos · 181s | Kaldheim Promos | 181s | Rare | €0.36 |
| Kolvori, God of Kinship // The Ringhart CrestThe List Tokens · KHM-181 | The List Tokens | KHM-181 | Rare | $0.32 |
| Kolvori, God of Kinship // The Ringhart CrestMagic Online Promos · 88348 | Magic Online Promos | 88348 | Rare | — |
| Koma and Toski, CompleatedUnknown Event · RZ08b | Unknown Event | RZ08b | Rare | — |
| Komainu Battle ArmorNeon Dynasty Commander · 21 | Neon Dynasty Commander | 21 | Rare | €2.01 |
| Komainu Battle ArmorNeon Dynasty Commander · 60 | Neon Dynasty Commander | 60 | Rare | €3.03 |
| Komainu Battle ArmorThe List Tokens · NEC-21 | The List Tokens | NEC-21 | Rare | $3.83 |
| Komainu Battle ArmorMagic Online Promos · 97995 | Magic Online Promos | 97995 | Rare | — |
| Koma, World-EaterFoundations · 121 | Foundations | 121 | Rare | $0.57 |
| Koma, World-EaterFoundations · 347 | Foundations | 347 | Rare | $3.49 |
| Koma, World-EaterFoundations · 408 | Foundations | 408 | Rare | €34.28 |
| Koma, World-EaterFoundations · 480 | Foundations | 480 | Rare | €1.20 |
| Koma, World-EaterFoundations Promos · 121p | Foundations Promos | 121p | Rare | €0.63 |
| Koma, World-EaterFoundations Promos · 121s | Foundations Promos | 121s | Rare | €0.75 |
| Kona, Rescue BeastieDuskmourn: House of Horror · 187 | Duskmourn: House of Horror | 187 | Rare | €0.66 |
| Kona, Rescue BeastieDuskmourn: House of Horror · 299 | Duskmourn: House of Horror | 299 | Rare | €1.08 |
| Kona, Rescue BeastieDuskmourn: House of Horror · 358 | Duskmourn: House of Horror | 358 | Rare | €1.16 |
| Kona, Rescue BeastieDuskmourn: House of Horror Promos · 187p | Duskmourn: House of Horror Promos | 187p | Rare | €0.62 |
| Kona, Rescue BeastieDuskmourn: House of Horror Promos · 187s | Duskmourn: House of Horror Promos | 187s | Rare | €2.16 |
| Kona, Rescue BeastieSecret Lair Drop Tokens · 2785 | Secret Lair Drop Tokens | 2785 | Rare | $4.76 |
| Konda, Lord of EiganjoChampions of Kamigawa · 30 | Champions of Kamigawa | 30 | Rare | €1.83 |
| Konda, Lord of EiganjoThe List Tokens · CHK-30 | The List Tokens | CHK-30 | Rare | — |
| Konda's BannerChampions of Kamigawa · 259 | Champions of Kamigawa | 259 | Rare | €4.36 |
| Konda's BannerSecret Lair Drop Tokens · 2772 | Secret Lair Drop Tokens | 2772 | Rare | $3.78 |
| Kongming's ContraptionsPortal Three Kingdoms · 10 | Portal Three Kingdoms | 10 | Rare | €20.83 |
| Kongming, "Sleeping Dragon"Commander 2013 · 16 | Commander 2013 | 16 | Rare | €0.17 |
| Kongming, "Sleeping Dragon"Portal Three Kingdoms · 9 | Portal Three Kingdoms | 9 | Rare | €12.96 |
| Kongming, "Sleeping Dragon"Masters Edition III · 16 | Masters Edition III | 16 | Rare | — |
| Kongming, "Sleeping Dragon"Magic Online Promos · 33442 | Magic Online Promos | 33442 | Rare | — |
| Kongming, "Sleeping Dragon"Vintage Masters · 33 | Vintage Masters | 33 | Rare | — |
| KookusVisions · 86 | Visions | 86 | Rare | €0.43 |
| Kopala, Warden of WavesThe Lost Caverns of Ixalan Commander · 160 | The Lost Caverns of Ixalan Commander | 160 | Rare | $0.40 |
| Kopala, Warden of WavesIxalan Promos · 61p | Ixalan Promos | 61p | Rare | €0.89 |
| Kopala, Warden of WavesIxalan Promos · 61s | Ixalan Promos | 61s | Rare | €2.16 |
| Kopala, Warden of WavesIxalan · 61 | Ixalan | 61 | Rare | €0.39 |
| Kor DuelistDCI Promos · 32 | DCI Promos | 32 | Rare | €0.23 |
| Kor FirewalkerDCI Promos · 36 | DCI Promos | 36 | Rare | €0.44 |
| Kor HavenNemesis · 141 | Nemesis | 141 | Rare | €13.17 |
| Kor Haven30th Anniversary Play Promos · 8 | 30th Anniversary Play Promos | 8 | Rare | €26.25 |
| Korlash, Heir to BlackbladeFuture Sight · 87 | Future Sight | 87 | Rare | €1.48 |
| Korlash, Heir to BlackbladeFuture Sight Promos · 87★ | Future Sight Promos | 87★ | Rare | €1.84 |