| Kaiser DragonMcDonald's Promotional Cards 2 · 011 | McDonald's Promotional Cards 2 | 011 | Common | $1.45 |
| Kaiser GliderDark Crisis · 051 | Dark Crisis | 051 | Ultra Rare | $0.02 |
| Kaiser Glider - Golden BurstLegendary Duelists: Season 3 · 136 | Legendary Duelists: Season 3 | 136 | Secret Rare | $0.25 |
| Kaiser Sea HorseStarter Deck: Kaiba Evolution · 015 | Starter Deck: Kaiba Evolution | 015 | Ultra Rare | €0.04 |
| Kaiser Sea SnakeMaximum Crisis · 091 | Maximum Crisis | 091 | Common | €0.04 |
| Kaiser Vorse RaiderYu-Gi-Oh! The Dark Side of Dimensions Movie Pack · 002 | Yu-Gi-Oh! The Dark Side of Dimensions Movie Pack | 002 | Ultra Rare | €0.22 |
| KaitopteraMaze of Millennia · 012 | Maze of Millennia | 012 | Super Rare | €0.38 |
| Kaiza the Hidden StarBattle of Chaos · 022 | Battle of Chaos | 022 | Common | €0.03 |
| Kalantosa, Mystical Beast of the ForestLegacy of the Valiant · 036 | Legacy of the Valiant | 036 | Common | €0.10 |
| KamakirimanUnlisted Printings | Unlisted Printings | — | — | €2.52 |
| Kaminari AttackMetal Raiders · 041 | Metal Raiders | 041 | Common | €0.15 |
| Kaminote BlowThe Lost Millennium · 042 | The Lost Millennium | 042 | Common | €0.10 |
| Kamion, the TimelordBattles of Legend: Light's Revenge · 034 | Battles of Legend: Light's Revenge | 034 | Ultra Rare | $0.27 |
| KamionwizardAstral Pack Three · 021 | Astral Pack Three | 021 | Short Print | €3.67 |
| Kamui, Hope of GustoDuel Terminal 6b · 080 | Duel Terminal 6b | 080 | Duel Terminal Normal Parallel Rare | $0.27 |
| Kanan the SwordmistressLegendary Collection 3: Yugi's World Mega Pack · 228 | Legendary Collection 3: Yugi's World Mega Pack | 228 | Ultra Rare | $1.76 |
| Kangaroo ChampFlaming Eternity · 016 | Flaming Eternity | 016 | Common | €0.15 |
| KanikabutoUnlisted Printings | Unlisted Printings | — | — | €0.88 |
| Kanzashi the Rikka QueenSecret Slayers · 021 | Secret Slayers | 021 | Super Rare | €0.23 |
| Kappa AvengerUnlisted Printings | Unlisted Printings | — | — | — |
| Karakuri AnatomyStarstrike Blast · 048 | Starstrike Blast | 048 | Common | €0.35 |
| Karakuri Barrel mdl 96 "Shinkuro"Starstrike Blast · 088 | Starstrike Blast | 088 | Rare | $0.43 |
| Karakuri Bonze mdl 9763 "Kunamzan"Ignition Assault · 014 | Ignition Assault | 014 | Common | €0.06 |
| Karakuri Bushi mdl 6318 "Muzanichiha"Starstrike Blast · 023 | Starstrike Blast | 023 | Rare | €0.25 |
| Karakuri Cash CacheStorm of Ragnarok · 052 | Storm of Ragnarok | 052 | Common | €0.08 |
| Karakuri Cash InnIgnition Assault · 073 | Ignition Assault | 073 | Common | €0.05 |
| Karakuri Cash ShedExtreme Victory · 074 | Extreme Victory | 074 | Super Rare | €0.71 |
| Karakuri Gama mdl 4624 "Shirokunishi"Ignition Assault · 015 | Ignition Assault | 015 | Common | €0.08 |
| Karakuri Gama OilIgnition Assault · 058 | Ignition Assault | 058 | Common | €0.06 |
| Karakuri Gold DustStorm of Ragnarok · 053 | Storm of Ragnarok | 053 | Common | €0.02 |
| Karakuri KlockStarstrike Blast · 072 | Starstrike Blast | 072 | Super Rare | $1.58 |
| Karakuri Komachi mdl 224 "Ninishi"Extreme Victory · 030 | Extreme Victory | 030 | Common | $0.25 |
| Karakuri Merchant mdl 177 "Inashichi"Starstrike Blast · 020 | Starstrike Blast | 020 | Rare | €3.93 |
| Karakuri Muso mdl 818 "Haipa"Storm of Ragnarok · 083 | Storm of Ragnarok | 083 | Ultra Rare | $0.71 |
| Karakuri Ninja mdl 339 "Sazank"Starstrike Blast · 022 | Starstrike Blast | 022 | Super Rare | €4.31 |
| Karakuri Ninja mdl 7749 "Nanashick"Extreme Victory · 031 | Extreme Victory | 031 | Common | €0.22 |
| Karakuri Ninja mdl 919 "Kuick"Storm of Ragnarok · 028 | Storm of Ragnarok | 028 | Common | €0.09 |
| Karakuri Shogun mdl 00 "Burei"Starstrike Blast · 043 | Starstrike Blast | 043 | Ultra Rare | $0.49 |
| Karakuri Showdown CastleStarstrike Blast · 046 | Starstrike Blast | 046 | Rare | $0.35 |
| Karakuri Soldier mdl 236 "Nisamu"Starstrike Blast · 019 | Starstrike Blast | 019 | Common | €0.29 |
| Karakuri SpiderStarstrike Blast · 090 | Starstrike Blast | 090 | Common | €0.14 |
| Karakuri Steel Shogun mdl 00X "Bureido"Storm of Ragnarok · 042 | Storm of Ragnarok | 042 | Ultra Rare | €0.37 |
| Karakuri Strategist mdl 248 "Nishipachi"Starstrike Blast · 021 | Starstrike Blast | 021 | Common | €0.69 |
| Karakuri Super Shogun mdl 00N "Bureibu"Ignition Assault · 043 | Ignition Assault | 043 | Super Rare | $0.11 |
| Karakuri Trick HouseStarstrike Blast · 071 | Starstrike Blast | 071 | Common | €0.19 |
| Karakuri Watchdog mdl 313 "Saizan"Storm of Ragnarok · 027 | Storm of Ragnarok | 027 | Common | €0.27 |
| Karate ManMagic Ruler · 083 | Magic Ruler | 083 | Rare | €0.08 |
| Karbonala WarriorLegend of Blue Eyes White Dragon · 067 | Legend of Blue Eyes White Dragon | 067 | Rare | €0.15 |
| Karin the Celestial Sage of the Highest HeightsUnlisted Printings | Unlisted Printings | — | — | — |
| Karma CutShadow of Infinity · 053 | Shadow of Infinity | 053 | Rare | €1.21 |