| Kotose, the Silent SpiderMagic Online Promos · 98071 | Magic Online Promos | 98071 | Rare | — |
| Kozilek, CompleatedMystery Booster 2 Tokens · 502 | Mystery Booster 2 Tokens | 502 | Rare | €0.32 |
| Kozilek's CommandModern Horizons 3 · 11 | Modern Horizons 3 | 11 | Rare | €7.05 |
| Kozilek's CommandModern Horizons 3 Promos · 11p | Modern Horizons 3 Promos | 11p | Rare | €6.95 |
| Kozilek's CommandModern Horizons 3 Promos · 11s | Modern Horizons 3 Promos | 11s | Rare | €14.03 |
| Kozilek's CommandSecret Lair Promo · 52 | Secret Lair Promo | 52 | Rare | €124.52 |
| KrakilinTempest Remastered · 177 | Tempest Remastered | 177 | Rare | — |
| Krang, Master MindTeenage Mutant Ninja Turtles · 43 | Teenage Mutant Ninja Turtles | 43 | Rare | $0.97 |
| Krang, Master MindTeenage Mutant Ninja Turtles · 230 | Teenage Mutant Ninja Turtles | 230 | Rare | $1.29 |
| Krang & ShredderTeenage Mutant Ninja Turtles · 153 | Teenage Mutant Ninja Turtles | 153 | Rare | $0.38 |
| Krang & ShredderTeenage Mutant Ninja Turtles · 201 | Teenage Mutant Ninja Turtles | 201 | Rare | €1.62 |
| Krang & ShredderTeenage Mutant Ninja Turtles · 245 | Teenage Mutant Ninja Turtles | 245 | Rare | €0.82 |
| Krang, the All-PowerfulTeenage Mutant Ninja Turtles Eternal · 13 | Teenage Mutant Ninja Turtles Eternal | 13 | Rare | €0.39 |
| Krang, the All-PowerfulTeenage Mutant Ninja Turtles Eternal · 86 | Teenage Mutant Ninja Turtles Eternal | 86 | Rare | €27.52 |
| Krark-Clan IronworksSecret Lair Countdown · 11 | Secret Lair Countdown | 11 | Rare | €9.19 |
| Krark-Clan IronworksSecret Lair Countdown · 38 | Secret Lair Countdown | 38 | Rare | €28.04 |
| Krark's ThumbMirrodin · 190 | Mirrodin | 190 | Rare | €5.58 |
| Krark's ThumbThe List Tokens · MRD-190 | The List Tokens | MRD-190 | Rare | €7.49 |
| Krark's Thumb // Krark's ThumbSecret Lair Drop Tokens · 383 | Secret Lair Drop Tokens | 383 | Rare | €16.53 |
| Krark, the ThumblessCommander Legends · 189 | Commander Legends | 189 | Rare | €1.32 |
| Krark, the ThumblessCommander Legends · 574 | Commander Legends | 574 | Rare | €1.55 |
| Krark, the ThumblessThe List Tokens · CMR-189 | The List Tokens | CMR-189 | Rare | €2.13 |
| Krark, the ThumblessMagic Online Promos · 86240 | Magic Online Promos | 86240 | Rare | — |
| Krark, the Thumbless // Krark, the ThumblessSecret Lair Drop Tokens · 1543 | Secret Lair Drop Tokens | 1543 | Rare | $9.28 |
| Kraum, Ludevic's OpusCommander 2016 · 34 | Commander 2016 | 34 | Rare | €5.79 |
| Kraum, Ludevic's OpusFinal Fantasy: Through the Ages · 56 | Final Fantasy: Through the Ages | 56 | Rare | €2.44 |
| Kraum, Ludevic's OpusTreasure Chest · 46 | Treasure Chest | 46 | Rare | — |
| Kraven's Last HuntMarvel's Spider-Man Promos · 105s | Marvel's Spider-Man Promos | 105s | Rare | $0.67 |
| Kraven's Last HuntMarvel's Spider-Man · 105 | Marvel's Spider-Man | 105 | Rare | €0.17 |
| Kraven's Last HuntMarvel's Spider-Man · 226 | Marvel's Spider-Man | 226 | Rare | $0.32 |
| Kraven's Last HuntThrough the Omenpaths · 121 | Through the Omenpaths | 121 | Rare | — |
| Kraven the HunterMarvel's Spider-Man Promos · 133s | Marvel's Spider-Man Promos | 133s | Rare | $0.84 |
| Kraven the HunterMarvel's Spider-Man · 133 | Marvel's Spider-Man | 133 | Rare | $0.24 |
| Kraven the HunterMarvel's Spider-Man · 273 | Marvel's Spider-Man | 273 | Rare | €0.13 |
| Kraven the HunterThrough the Omenpaths · 127 | Through the Omenpaths | 127 | Rare | — |
| Krav, the UnredeemedBattlebond · 4 | Battlebond | 4 | Rare | $2.41 |
| Krav, the UnredeemedBattlebond Promos · 4s | Battlebond Promos | 4s | Rare | €5.26 |
| Krenko, Baron of Tin StreetMurders at Karlov Manor · 135 | Murders at Karlov Manor | 135 | Rare | €0.24 |
| Krenko, Baron of Tin StreetMurders at Karlov Manor · 350 | Murders at Karlov Manor | 350 | Rare | €0.26 |
| Krenko, Baron of Tin StreetMurders at Karlov Manor Promos · 135p | Murders at Karlov Manor Promos | 135p | Rare | €0.39 |
| Krenko, Baron of Tin StreetMurders at Karlov Manor Promos · 135s | Murders at Karlov Manor Promos | 135s | Rare | €1.16 |
| Krenko, Mob BossCommander Masters · 238 | Commander Masters | 238 | Rare | €1.42 |
| Krenko, Mob BossCommander Masters · 543 | Commander Masters | 543 | Rare | €23.07 |
| Krenko, Mob BossDuel Decks: Speed vs. Cunning Tokens · 15 | Duel Decks: Speed vs. Cunning Tokens | 15 | Rare | €1.57 |
| Krenko, Mob BossDuel Decks: Merfolk vs. Goblins · 52 | Duel Decks: Merfolk vs. Goblins | 52 | Rare | €1.47 |
| Krenko, Mob BossFoundations · 204 | Foundations | 204 | Rare | €1.67 |
| Krenko, Mob BossJumpstart · 339 | Jumpstart | 339 | Rare | €1.67 |
| Krenko, Mob BossJumpstart 2022 · 564 | Jumpstart 2022 | 564 | Rare | €1.48 |
| Krenko, Mob BossMagic 2013 · 138 | Magic 2013 | 138 | Rare | €1.45 |
| Krenko, Mob BossFoundations Promos · 204s | Foundations Promos | 204s | Rare | €6.01 |