| Name | Cost | Price |
|---|---|---|
| Kor Sky Climber | $0.07 | |
| Kor Spiritdancer | $0.36 | |
| Korvold, Fae-Cursed King | $19.57 | |
| Korvold, Gleeful Glutton | $1.00 | |
| Kosei, Penitent Warlord | $0.32 | |
| Koskun Falls | $16.27 | |
| Koskun Keep | $0.21 | |
| Koth, Fire of Resistance | $0.56 | |
| Kothophed, Soul Hoarder | $0.33 | |
| Kotori, Pilot Prodigy | — | |
| Kotose, the Silent Spider | $0.25 | |
| Kozilek, Butcher of Truth | $49.72 | |
| Kozilek's Predator | $0.11 | |
| Kozilek's Return | — | |
| Kozilek, the Broken Reality | $3.37 | |
| Kozilek, the Great Distortion | — | |
| Kragma Butcher | $0.09 | |
| Kraken Hatchling | $0.08 | |
| Kraken of the Straits | $0.25 | |
| Kraken's Eye | $0.11 | |
| Krang, Master Mind | $1.60 | |
| Krang, the All-Powerful | $0.38 | |
| Krang, Utrom Warlord | — | |
| Kranioceros | $0.02 |