- Compensation Exchange
- Compensation Mediation
- Compulsory Evacuation Device
- Compulsory Recoil Device
- Conduction Warrior Linear Magnum ±
- Confiscation
- Confusion Chaff
- Construction Train Signal Red
- Contact
- Contact Out
- Contact Soul
- Contagion of Madness
- Contaminated Earth
- Contract with Exodia
- Convert Contact
- Convert Ghost
- Copy Doll
- Copy Knight
- Copy Plant
- Copycat
- Corkscrew Counter
- Corridor to Dark World
- Corrupted Keys
- Cosmic Blast