| Knuckles the Echidna (2 variants) | 2082 |
| Kodama's Reach (2 variants) | 2294 |
| Kodama's Reach (2 variants) | 371 |
| Kogla, the Titan Ape | 1274 |
| Kokusho, the Evening Star | 1528 |
| Koma, Cosmos Serpent (2 variants) | 1765 |
| Korvold, Fae-Cursed King (2 variants) | 1625 |
| Koth of the Hammer (2 variants) | 1248 |
| Kothophed, Soul Hoarder (2 variants) | 162 |
| Kothophed, Soul Hoarder | 162★ |
| Kozilek, the Great Distortion (2 variants) | 493 |
| Krark, the Thumbless // Krark, the Thumbless (2 variants) | 1543 |
| Krark's Thumb // Krark's Thumb | 383 |
| Kratos, God of War (2 variants) | 2207 |
| Kratos, Stoic Father (2 variants) | 2213 |
| Krenko, Mob Boss | 2407 |
| Krenko, Tin Street Kingpin (2 variants) | 1027 |
| Krosan Beast | 196 |
| Krosan Grip (2 variants) | 481 |
| Kroxa, Titan of Death's Hunger (2 variants) | 225 |
| Kruphix, God of Horizons | 73 |
| Kumena, Tyrant of Orazca | 1412★ |
| Kumena, Tyrant of Orazca | 1412 |
| Kynaios and Tiro of Meletis (2 variants) | 2806 |
| Laboratory Maniac (2 variants) | 1097 |
| Laboratory Maniac | 1394★ |
| Laboratory Maniac | 1394 |
| Lara Croft, Tomb Raider (2 variants) | 1501 |
| Last Chance | 405 |
| Lathliss, Dragon Queen (2 variants) | 1145 |
| Lathliss, Dragon Queen (2 variants) | 1146 |
| Lathril, Blade of the Elves (2 variants) | 2681 |
| Lava Dart (2 variants) | 2037 |
| Lava Dart | 2042 |
| Lava Spike | 2054 |
| Lava Spike (2 variants) | 2049 |
| Lavabelly Sliver | 665 |
| Lavinia, Azorius Renegade | 1685 |
| Leeching Sliver | 632 |
| Leonin Warleader | 22 |
| Leshrac's Sigil (2 variants) | 1188 |
| Lethal Scheme (2 variants) | 2187 |
| Liberator, Urza's Battlethopter (2 variants) | 2286 |
| Lier, Disciple of the Drowned (2 variants) | 2350 |
| Liesa, Shroud of Dusk | 1961 |
| Life from the Loam | 8 |
| Light Up the Stage | 2528 |
| Light-Paws, Emperor's Voice (2 variants) | 1877 |
| Lightning Bolt | 901 |
| Lightning Bolt (2 variants) | 2289 |