| Kobolds of Kher Keep | TMKC-12 |
| Knowledge Pool (2 variants) | MBS-111 |
| Knollspine Dragon | SHM-98 |
| Knightly Valor | RTR-13 |
| Knight-Captain of Eos | ALA-17 |
| Knight of the Tusk | M19-18 |
| Knight of the Skyward Eye | A25-19 |
| Knight of the Holy Nimbus | TSP-26 |
| Knight of Sorrows | RNA-14 |
| Knight of Old Benalia | MH1-17 |
| Knight of Meadowgrain | DDG-5 |
| Knight of Dawn | TMP-26 |
| Knight of Cliffhaven | DDP-5 |
| Knight Exemplar | M11-20 |
| Knight Exemplar | DDG-14 |
| Klothys, God of Destiny | THB-220 |
| Klauth, Unrivaled Ancient | AFC-50 |
| Kitt Kanto, Mayhem Diva | NCC-4 |
| Kitsune Blademaster | CHK-25 |
| Kite Shield | M12-210 |
| Kiss of the Amesha | BBD-225 |
| Kirri, Talented Sprout | OTC-7 |
| Kird Ape | EMA-137 |
| Kiora's Follower | DDO-52 |
| Kiora's Dambreaker | WAR-58 |
| Kiora, Behemoth Beckoner | WAR-232 |
| Kinsbaile Cavalier | MOR-15 |
| Kinnan, Bonder Prodigy | IKO-192 |
| Kingpin's Pet | GTC-173 |
| King of the Pride | MH1-16 |
| Kindred Dominance | C17-18 |
| Kindred Discovery | C17-11 |
| Kindred Boon | C17-5 |
| Kin-Tree Warden | KTK-139 |
| Kin-Tree Invocation | KTK-183 |
| Kilnmouth Dragon | DDG-59 |
| Kiln Fiend | IMA-137 |
| Killer Whale | EXO-37 |
| Kiki-Jiki, Mirror Breaker | MM2-121 |
| Kiki-Jiki, Mirror Breaker | CHK-175 |
| Kher Keep | MKC-270 |
| Kher Keep | TSP-275 |
| Khenra Scrapper | HOU-100 |
| Khalni Hydra | ROE-192 |
| Khalni Heart Expedition | C18-154 |
| Khalni Garden | DDR-28 |
| Ketria Triome | IKO-250 |
| Kenrith's Transformation | AFC-162 |
| Kenrith, the Returned King | ELD-303 |
| Kemba's Legion | MBS-9 |