| Coral DragonThe Dark Illusion · 051 | The Dark Illusion | 051 | Secret Rare | $0.13 |
| Coralianectes, the Luminous Cradle DragonBeyond the Brave · 029 | Beyond the Brave | 029 | Common | €0.08 |
| Core BlastAbsolute Powerforce · 072 | Absolute Powerforce | 072 | Rare | $0.12 |
| Core BlasterAncient Prophecy · 053 | Ancient Prophecy | 053 | Common | €0.04 |
| Core CompressionAncient Prophecy · 052 | Ancient Prophecy | 052 | Super Rare | €0.46 |
| Core of ChaosPhoton Hypernova · 011 | Photon Hypernova | 011 | Common | €0.03 |
| Core OverclockThe Shining Darkness · 087 | The Shining Darkness | 087 | Super Rare | $0.16 |
| Core ReinforcementAncient Prophecy · 073 | Ancient Prophecy | 073 | Rare | €0.15 |
| Core Transport UnitAbsolute Powerforce · 089 | Absolute Powerforce | 089 | Secret Rare | $14.23 |
| Cornfield CoatlDuelist Nexus · 005 | Duelist Nexus | 005 | Common | €0.07 |
| Corridor of AgonyThe Shining Darkness · 062 | The Shining Darkness | 062 | Short Print | €0.37 |
| Corroding SharkTournament Pack: 1st Season · 020 | Tournament Pack: 1st Season | 020 | Common | €1.71 |
| Corrosive ScalesLegendary Duelists: Ancient Millennium · 010 | Legendary Duelists: Ancient Millennium | 010 | Rare | €0.09 |
| Corrupted KeysJudgment of the Light · 072 | Judgment of the Light | 072 | Rare | $0.13 |
| Corruption Cell "A"Cyberdark Impact · 037 | Cyberdark Impact | 037 | Common | €0.09 |
| Cosmic Blazar DragonDuelist Saga · 034 | Duelist Saga | 034 | Ultra Rare | €0.74 |
| Cosmic CompassStorm of Ragnarok · 001 | Storm of Ragnarok | 001 | Common | €0.09 |
| Cosmic CycloneThe Dark Illusion · 065 | The Dark Illusion | 065 | Secret Rare | €0.02 |
| Cosmic FlareDuelist Saga · 036 | Duelist Saga | 036 | Ultra Rare | €0.07 |
| Cosmic Fortress Gol'garCrimson Crisis · 044 | Crimson Crisis | 044 | Ultra Rare | €16.90 |
| Cosmic Horror Gangi'elPower of the Duelist · 029 | Power of the Duelist | 029 | Rare | $0.30 |
| Cosmic Quasar DragonDuelist Nexus · 037 | Duelist Nexus | 037 | Ultra Rare | €2.00 |
| Cosmic Slicer Zer'ollDawn of Majesty · 047 | Dawn of Majesty | 047 | Common | €0.05 |
| Cosmic Tree IrmistilThe Infinite Forbidden · 051 | The Infinite Forbidden | 051 | Common | €0.06 |
| Cosmo BrainCybernetic Horizon · 020 | Cybernetic Horizon | 020 | Common | €0.05 |
| Cosmo QueenMcDonald's Promotional Cards · 002 | McDonald's Promotional Cards | 002 | Ultra Rare | €0.57 |
| Cosmo Queen the Queen of PrayersThe Infinite Forbidden · 024 | The Infinite Forbidden | 024 | Common | €0.05 |
| Cosmos ChannellingLegendary Duelists: Rage of Ra · 036 | Legendary Duelists: Rage of Ra | 036 | Rare | €0.07 |
| Cost DownDark Crisis · 053 | Dark Crisis | 053 | Ultra Rare | €0.08 |
| Counselor LilyThe Duelist Genesis · 081 | The Duelist Genesis | 081 | Super Rare | €0.32 |
| Counter CleanerCyberdark Impact · 041 | Cyberdark Impact | 041 | Common | €0.05 |
| Counter CounterTactical Evolution · 080 | Tactical Evolution | 080 | Common | €0.13 |
| CounterforceOrder of Chaos · 064 | Order of Chaos | 064 | Common | €0.05 |
| Counter GateYu-Gi-Oh! The Dark Side of Dimensions Movie Pack · 010 | Yu-Gi-Oh! The Dark Side of Dimensions Movie Pack | 010 | Ultra Rare | €0.11 |
| Counter GemDuelist Pack: Jesse Anderson · 024 | Duelist Pack: Jesse Anderson | 024 | Ultra Rare | €0.08 |
| Counter Spell "Negate Attack"Unlisted Printings | Unlisted Printings | — | — | — |
| Couple of AcesPhoton Hypernova · 027 | Photon Hypernova | 027 | Common | $0.06 |
| Couplet the Melodious SongstressLegacy of Destruction · 010 | Legacy of Destruction | 010 | Common | €0.07 |
| Courageous Crimson Chevalier BradamanteBattles of Legend: Monstrous Revenge · 014 | Battles of Legend: Monstrous Revenge | 014 | Secret Rare | €0.25 |
| Court of CardsKing's Court · 008 | King's Court | 008 | Super Rare | €0.20 |
| Court of JusticeLegendary Collection 2: The Duel Academy Years · 013 | Legendary Collection 2: The Duel Academy Years | 013 | Ultra Rare | €0.03 |
| Covering FireRise of Destiny · 060 | Rise of Destiny | 060 | Rare | €0.07 |
| Crab TurtleMagic Ruler · 069 | Magic Ruler | 069 | Common | €0.04 |
| CrackdownDark Neostorm · 078 | Dark Neostorm | 078 | Super Rare | €0.10 |
| CrackingGeneration Force · 052 | Generation Force | 052 | Common | $0.05 |
| Cracking DragonCode of the Duelist · 014 | Code of the Duelist | 014 | Super Rare | €0.09 |
| Crackle BlitzcliqueChaos Origins · 012 | Chaos Origins | 012 | Secret Rare | €5.55 |
| Crane CraneSuper Starter Power-Up Pack · 06 | Super Starter Power-Up Pack | 06 | Common | €0.06 |
| Cranium FishTactical Evolution · 083 | Tactical Evolution | 083 | Secret Rare | $11.99 |
| Crashbug RoadGeneration Force · 050 | Generation Force | 050 | Common | €0.10 |