- Crystal Skull
- Crystal Tree
- Crystal Veil
- Cup of Ace
- Cup of Sealed Soul
- Cupid's Kiss
- Curry Fiend Roo
- Curry Pot
- Curse of Dragon
- Curse of Fiend
- Curse of the Masked Beast
- Curse of Thorns
- Curse Reflection Doll
- Curse Transfer
- Cursebreaker
- Cursed Dollhouse
- Cursed Ivy
- Cursed Prison
- Cursed Seal of the Forbidden Spell
- Cursed Synchro
- Cursed Twin Dolls
- Cursed Waters Level 3
- Curtain of the Dark Ones
- CXyz Battleship Cherry Blossom