| Jace Beleren | 29 |
| Jeskai Baller | 517 |
| Jund 'Em Out | 596 |
| Karn, Legacy Reforged | 255 |
| Karn, the Great Creator | 3 |
| Kataki, War's Wage (2 variants) | 148 |
| Keeper of the Crown // Coronation of the Wilds | 577 |
| Kenrith, the Returned King | 13 |
| Keruga, the Macrosage | 84 |
| King's Assassin | 43 |
| Kitchen Finks | 85 |
| Knight of Lost Causes | 518 |
| Kobolds of Kher Keep (2 variants) | 194 |
| Kozilek, Compleated | 502 |
| Krark-Clan Ironworks (2 variants) | 224 |
| Lavinia, Azorius Renegade | 86 |
| Lazotep Archway | 613 |
| Leyline of Sanctity | 14 |
| Leyline of the Void | 44 |
| Lich's Duel Mastery | 546 |
| Lifening Elemental | 547 |
| Lifetap | 125 |
| Lightning Greaves (2 variants) | 225 |
| Liliana's Other Contract // Liliana's Undead Minion | 548 |
| Lim-Dûl's Vault | 87 |
| Lotus Petal (2 variants) | 226 |
| Lutri, Pauper Otter | 597 |
| Luxior, Ignited | 606 |
| Maddening Hex (2 variants) | 195 |
| Madlands | 614 |
| Maestros' Totally Safe Hideout | 615 |
| Magus of the Chains | 549 |
| Mana Flare (2 variants) | 196 |
| Mana Short (2 variants) | 166 |
| Manabond (2 variants) | 208 |
| Map to Lorthos's Temple | 531 |
| Marchesa's Surprise Party | 503 |
| Mardu Outrider | 1 |
| Meandered Towershell | 578 |
| Meekstone (2 variants) | 227 |
| Memnite (2 variants) | 228 |
| Mental Misstep | 30 |
| Merchant Scroll (2 variants) | 167 |
| Microscope | 607 |
| Mind Twist (2 variants) | 184 |
| Mindbreak Trap (2 variants) | 168 |
| Minsc & Boo, Timeless Heroes | 88 |
| Mirri, Weatherlight Duelist | 252 |
| Mirri's Guile (2 variants) | 209 |
| Mishra's Bauble | 97 |