| Corpsehatch | DDP-50 |
| Corpsejack Menace | IMA-197 |
| Corrupt | USG-124 |
| Corrupted Conscience | MBS-22 |
| Cosima, God of the Voyage // The Omenkeel | KHM-50 |
| Cosmos Elixir | KHM-237 |
| Cosmotronic Wave | GRN-95 |
| Costly Plunder | XLN-96 |
| Council Guardian | CNS-15 |
| Council's Judgment | CNS-16 |
| Counterbalance | CSP-31 |
| Counterlash | DKA-33 |
| Counterspell | CMR-395 |
| Counterspell | A25-50 |
| Countersquall | DDH-59 |
| Countless Gears Renegade | AER-13 |
| Courage in Crisis | WAR-158 |
| Courser of Kruphix | A25-164 |
| Court Homunculus | MM2-13 |
| Court Hussar | A25-51 |
| Court of Grace | CMR-16 |
| Court Street Denizen | DDO-5 |
| Covenant of Blood | M15-91 |
| Coveted Jewel | C18-54 |
| Coveted Peacock | CN2-29 |
| Cower in Fear | MM3-62 |
| Crackdown Construct | AER-148 |
| Cradle Guard | USG-245 |
| Cragcrown Pathway // Timbercrown Pathway | ZNR-261 |
| Cragganwick Cremator | SHM-87 |
| Cragsmasher Yeti | MOM-333 |
| Cranial Plating | TSR-392 |
| Crash Through | M19-133 |
| Crashing Boars | EXO-108 |
| Crashing Tide | RIX-34 |
| Creeping Mold | KLD-150 |
| Crenellated Wall | MMQ-290 |
| Crescendo of War | CMD-12 |
| Crested Sunmare | HOU-6 |
| Crib Swap | C18-65 |
| Crib Swap | M3C-168 |
| Crib Swap | LRW-11 |
| Crimson Fleet Commodore | CMR-171 |
| Crimson Muckwader | M13-127 |
| Crimson Wisps | SHM-88 |
| Crimson Wisps | J25-533 |
| Crippling Blight | M15-92 |
| Crippling Fatigue | TOR-58 |
| Crooked Custodian | SNC-71 |
| Crooked Scales | MMQ-291 |