| King of the OathbreakersThe Lord of the Rings: Tales of Middle-earth · 211 | The Lord of the Rings: Tales of Middle-earth | 211 | Rare | €0.19 |
| King of the OathbreakersThe Lord of the Rings: Tales of Middle-earth · 369 | The Lord of the Rings: Tales of Middle-earth | 369 | Rare | $0.38 |
| King of the OathbreakersThe Lord of the Rings: Tales of Middle-earth · 662 | The Lord of the Rings: Tales of Middle-earth | 662 | Rare | €1.68 |
| King of the OathbreakersThe Lord of the Rings: Tales of Middle-earth · 780 | The Lord of the Rings: Tales of Middle-earth | 780 | Rare | €0.95 |
| King of the OathbreakersTales of Middle-earth Promos · 211s | Tales of Middle-earth Promos | 211s | Rare | €1.58 |
| King of the PrideMagic Online Promos · 91225 | Magic Online Promos | 91225 | Rare | — |
| Kingpin, Wilson FiskMarvel Super Heroes Commander · 661 | Marvel Super Heroes Commander | 661 | Rare | $0.61 |
| King's AssassinMystery Booster 2 Tokens · 43 | Mystery Booster 2 Tokens | 43 | Rare | $0.27 |
| King's AssassinPortal · 98 | Portal | 98 | Rare | €4.99 |
| King Solomon's FrogsMarvel Super Heroes Commander · 20 | Marvel Super Heroes Commander | 20 | Rare | €0.21 |
| King Solomon's FrogsMarvel Super Heroes Commander · 312 | Marvel Super Heroes Commander | 312 | Rare | €0.78 |
| King SuleimanArabian Nights · 6 | Arabian Nights | 6 | Rare | €106.03 |
| Kinjalli's SunwingThe Lost Caverns of Ixalan Commander · 130 | The Lost Caverns of Ixalan Commander | 130 | Rare | €0.88 |
| Kinjalli's SunwingIxalan Promos · 19p | Ixalan Promos | 19p | Rare | $1.69 |
| Kinjalli's SunwingIxalan Promos · 19s | Ixalan Promos | 19s | Rare | €3.40 |
| Kinjalli's SunwingIxalan · 19 | Ixalan | 19 | Rare | €0.79 |
| Kinsbaile BorderguardMorningtide · 14 | Morningtide | 14 | Rare | €1.53 |
| Kinsbaile CavalierDuel Decks: Knights vs. Dragons · 17 | Duel Decks: Knights vs. Dragons | 17 | Rare | €3.79 |
| Kinsbaile CavalierMorningtide · 15 | Morningtide | 15 | Rare | €4.63 |
| Kinsbaile CavalierThe List Tokens · MOR-15 | The List Tokens | MOR-15 | Rare | $4.46 |
| Kinsbaile CavalierHistoric Anthology 1 · 3 | Historic Anthology 1 | 3 | Rare | — |
| Kinscaer SentryLorwyn Eclipsed · 22 | Lorwyn Eclipsed | 22 | Rare | $0.31 |
| Kinscaer SentryLorwyn Eclipsed · 300 | Lorwyn Eclipsed | 300 | Rare | $0.46 |
| Kinscaer SentryLorwyn Eclipsed Promos · 22p | Lorwyn Eclipsed Promos | 22p | Rare | €0.49 |
| Kinzu of the Bleak CovenPhyrexia: All Will Be One · 406 | Phyrexia: All Will Be One | 406 | Rare | €0.28 |
| Kinzu of the Bleak CovenPhyrexia: All Will Be One · 411 | Phyrexia: All Will Be One | 411 | Rare | $0.37 |
| Kiora, Behemoth BeckonerSecret Lair Drop Tokens · 1700 | Secret Lair Drop Tokens | 1700 | Rare | €10.83 |
| Kiora, the Rising TideFoundations · 45 | Foundations | 45 | Rare | $0.43 |
| Kiora, the Rising TideFoundations · 309 | Foundations | 309 | Rare | €1.94 |
| Kiora, the Rising TideFoundations · 377 | Foundations | 377 | Rare | €13.92 |
| Kiora, the Rising TideFoundations · 455 | Foundations | 455 | Rare | $0.73 |
| Kiora, the Rising TideFoundations Promos · 45p | Foundations Promos | 45p | Rare | $0.40 |
| Kiora, the Rising TideFoundations Promos · 45s | Foundations Promos | 45s | Rare | $1.57 |
| Kira, Great Glass-SpinnerBetrayers of Kamigawa · 40 | Betrayers of Kamigawa | 40 | Rare | €4.30 |
| Kira, Great Glass-SpinnerJumpstart · 154 | Jumpstart | 154 | Rare | €4.50 |
| Kira, Great Glass-SpinnerModern Masters · 49 | Modern Masters | 49 | Rare | $4.71 |
| Kira, Great Glass-SpinnerSecret Lair Drop Tokens · 421 | Secret Lair Drop Tokens | 421 | Rare | €7.40 |
| Kira, Great Glass-SpinnerThe List Tokens · JMP-154 | The List Tokens | JMP-154 | Rare | — |
| Kird ApeFriday Night Magic 2005 · 9 | Friday Night Magic 2005 | 9 | Rare | €1.47 |
| Kirol, Attentive First-YearLorwyn Eclipsed · 231 | Lorwyn Eclipsed | 231 | Rare | $0.25 |
| Kirol, Attentive First-YearLorwyn Eclipsed · 374 | Lorwyn Eclipsed | 374 | Rare | €0.35 |
| Kirol, Attentive First-YearLorwyn Eclipsed Promos · 231p | Lorwyn Eclipsed Promos | 231p | Rare | €0.34 |
| Kirtar's WrathCommander 2013 · 15 | Commander 2013 | 15 | Rare | $0.15 |
| Kirtar's WrathCommander Anthology · 14 | Commander Anthology | 14 | Rare | €0.15 |
| Kirtar's WrathOdyssey · 28 | Odyssey | 28 | Rare | €0.44 |
| Kirtar's WrathSalvat 2005 · C37 | Salvat 2005 | C37 | Rare | €0.13 |
| Kirtar's WrathCrimson Vow Commander · 91 | Crimson Vow Commander | 91 | Rare | €0.05 |
| Kishla VillageTarkir: Dragonstorm Promos · 259p | Tarkir: Dragonstorm Promos | 259p | Rare | €0.35 |
| Kishla VillageTarkir: Dragonstorm Promos · 259s | Tarkir: Dragonstorm Promos | 259s | Rare | €0.68 |
| Kishla VillageTarkir: Dragonstorm · 259 | Tarkir: Dragonstorm | 259 | Rare | €0.18 |