| Clive's HideawayFinal Fantasy Promos · 275s | Final Fantasy Promos | 275s | Rare | €3.16 |
| Cloak and Dagger, EntwinedMarvel Super Heroes · 211 | Marvel Super Heroes | 211 | Rare | €0.24 |
| Cloak and Dagger, EntwinedMarvel Super Heroes · 419 | Marvel Super Heroes | 419 | Rare | €0.61 |
| ClocknapperThe List (Unfinity Foil Edition) · 14 | The List (Unfinity Foil Edition) | 14 | Rare | $0.24 |
| ClocknapperUnstable · 29 | Unstable | 29 | Rare | €0.11 |
| Clockwork AvianFourth Edition Foreign Black Border · 306 | Fourth Edition Foreign Black Border | 306 | Rare | €7.32 |
| Clockwork AvianFourth Edition · 306 | Fourth Edition | 306 | Rare | €0.51 |
| Clockwork AvianAntiquities · 45 | Antiquities | 45 | Rare | €14.12 |
| Clockwork AvianBeatdown Box Set · 69 | Beatdown Box Set | 69 | Rare | €0.26 |
| Clockwork BeastUnlimited Edition · 237 | Unlimited Edition | 237 | Rare | $6.60 |
| Clockwork BeastRevised Edition · 240 | Revised Edition | 240 | Rare | €0.61 |
| Clockwork Beast30th Anniversary Edition · 232 | 30th Anniversary Edition | 232 | Rare | $9.85 |
| Clockwork Beast30th Anniversary Edition · 529 | 30th Anniversary Edition | 529 | Rare | €25.00 |
| Clockwork BeastFourth Edition Foreign Black Border · 307 | Fourth Edition Foreign Black Border | 307 | Rare | €5.87 |
| Clockwork BeastFourth Edition · 307 | Fourth Edition | 307 | Rare | €0.40 |
| Clockwork BeastFifth Edition · 356 | Fifth Edition | 356 | Rare | €0.36 |
| Clockwork BeastBeatdown Box Set · 70 | Beatdown Box Set | 70 | Rare | €0.26 |
| Clockwork BeastCollectors' Edition · 237 | Collectors' Edition | 237 | Rare | €3.04 |
| Clockwork BeastIntl. Collectors' Edition · 237 | Intl. Collectors' Edition | 237 | Rare | €3.07 |
| Clockwork BeastForeign Black Border · 240 | Foreign Black Border | 240 | Rare | €2.83 |
| Clockwork BeastIntroductory Two-Player Set · 49 | Introductory Two-Player Set | 49 | Rare | €0.22 |
| Clockwork BeastLimited Edition Alpha · 236 | Limited Edition Alpha | 236 | Rare | $240.29 |
| Clockwork BeastLimited Edition Beta · 237 | Limited Edition Beta | 237 | Rare | €38.07 |
| Clockwork BeastRivals Quick Start Set · 48 | Rivals Quick Start Set | 48 | Rare | — |
| Clockwork BeastSummer Magic / Edgar · 240 | Summer Magic / Edgar | 240 | Rare | — |
| Clockwork DragonMirrodin · 155 | Mirrodin | 155 | Rare | €0.29 |
| Clockwork DragonThe List Tokens · MRD-155 | The List Tokens | MRD-155 | Rare | €0.23 |
| CloneTenth Edition · 73 | Tenth Edition | 73 | Rare | €0.38 |
| CloneNinth Edition · 67 | Ninth Edition | 67 | Rare | €0.29 |
| CloneNinth Edition · 67★ | Ninth Edition | 67★ | Rare | $0.44 |
| CloneDuel Decks: Venser vs. Koth · 14 | Duel Decks: Venser vs. Koth | 14 | Rare | $0.35 |
| CloneMagic 2010 · 45 | Magic 2010 | 45 | Rare | €0.31 |
| CloneMagic 2011 · 49 | Magic 2011 | 49 | Rare | $0.30 |
| CloneMagic 2013 · 45 | Magic 2013 | 45 | Rare | €0.29 |
| CloneMagic 2014 · 47 | Magic 2014 | 47 | Rare | €0.33 |
| CloneOnslaught · 75 | Onslaught | 75 | Rare | €0.65 |
| CloneSecret Lair Drop Tokens · 7164 | Secret Lair Drop Tokens | 7164 | Rare | $2.62 |
| Clone CrafterAlchemy: Innistrad · 14 | Alchemy: Innistrad | 14 | Rare | — |
| Cloud CoverPlaneshift · 98 | Planeshift | 98 | Rare | €0.86 |
| Cloud DragonPortal · 45 | Portal | 45 | Rare | $2.34 |
| Cloud DragonThe List Tokens · POR-45 | The List Tokens | POR-45 | Rare | $0.37 |
| Cloud DragonMasters Edition IV · 41 | Masters Edition IV | 41 | Rare | — |
| Cloudhoof KirinSaviors of Kamigawa · 31 | Saviors of Kamigawa | 31 | Rare | €0.36 |
| Cloud KeyThe Brothers' War Retro Artifacts · 12 | The Brothers' War Retro Artifacts | 12 | Rare | €2.05 |
| Cloud KeyThe Brothers' War Retro Artifacts · 75 | The Brothers' War Retro Artifacts | 75 | Rare | €4.22 |
| Cloud KeyThe Brothers' War Retro Artifacts · 75z | The Brothers' War Retro Artifacts | 75z | Rare | €136.60 |
| Cloud KeyEdge of Eternities Commander · 54 | Edge of Eternities Commander | 54 | Rare | $1.77 |
| Cloud KeyFuture Sight · 160 | Future Sight | 160 | Rare | €2.68 |
| Cloud KeyThe List Tokens · FUT-160 | The List Tokens | FUT-160 | Rare | €2.73 |
| Cloud KeyTime Spiral Remastered · 265 | Time Spiral Remastered | 265 | Rare | €2.23 |