| Iron Core Immediate DisposalRaging Battle · 056 | Raging Battle | 056 | Common | €0.11 |
| Iron Core LusterAncient Prophecy · 074 | Ancient Prophecy | 074 | Common | €0.11 |
| Iron Core of Koa'ki MeiruDuelist Pack Collection Tin 2009 · 1 | Duelist Pack Collection Tin 2009 | 1 | Ultra Rare | €0.15 |
| Iron Core Specimen LabAbsolute Powerforce · 055 | Absolute Powerforce | 055 | Super Rare | $0.47 |
| Iron Dragon TiamatonFlames of Destruction · 032 | Flames of Destruction | 032 | Ultra Rare | €0.16 |
| Iron DrawBattles of Legend: Relentless Revenge · 034 | Battles of Legend: Relentless Revenge | 034 | Secret Rare | €0.06 |
| Ironhammer the GiantDuel Terminal 7b · 054 | Duel Terminal 7b | 054 | Duel Terminal Normal Parallel Rare | $0.14 |
| Iron HansBattles of Legend: Relentless Revenge · 006 | Battles of Legend: Relentless Revenge | 006 | Ultra Rare | €0.17 |
| Iron KnightBattles of Legend: Relentless Revenge · 007 | Battles of Legend: Relentless Revenge | 007 | Ultra Rare | $0.24 |
| Iron Knight of RevolutionYu-Gi-Oh! World Championship 2017 prize cards · 002 | Yu-Gi-Oh! World Championship 2017 prize cards | 002 | Extra Secret Rare | €35.00 |
| Iron ThunderPhantom Nightmare · 080 | Phantom Nightmare | 080 | Secret Rare | $0.23 |
| Island TurtlePharaoh's Servant · 095 | Pharaoh's Servant | 095 | Short Print | €0.02 |
| Isolde, Belle of the UnderworldPremium Gold: Return of the Bling · 010 | Premium Gold: Return of the Bling | 010 | Gold Secret Rare | €0.12 |
| Isolde, Two Tales of the Noble KnightsExtreme Force · 094 | Extreme Force | 094 | Ultra Rare | $0.30 |
| It's a Toon World!Speed Duel Starter Decks: Destiny Masters · 1 | Speed Duel Starter Decks: Destiny Masters | 1 | Common | $0.47 |
| It's Jinzo!Speed Duel: Battle City Box · 04 | Speed Duel: Battle City Box | 04 | Common | €0.13 |
| It's My Lucky Day!Speed Duel: Attack from the Deep · 04 | Speed Duel: Attack from the Deep | 04 | Super Rare | $0.47 |
| It's No Monster, It's a God!Speed Duel: Battle City Box · 02 | Speed Duel: Battle City Box | 02 | Common | €0.16 |
| I've Got Dino DNA!Speed Duel GX: Duel Academy Box · 19 | Speed Duel GX: Duel Academy Box | 19 | Common | $0.08 |
| Ivy ShacklesCrimson Crisis · 070 | Crimson Crisis | 070 | Common | $0.12 |
| Ivy TokenUnlisted Printings | Unlisted Printings | — | — | — |
| Ixeep, Omen of the GhotiDarkwing Blast · 086 | Darkwing Blast | 086 | Common | €0.15 |
| IzanagiThe Duelist Genesis · 030 | The Duelist Genesis | 030 | Super Rare | €0.61 |
| IzanamiThe Duelist Genesis · 083 | The Duelist Genesis | 083 | Rare | €0.21 |
| Jabbing PandaPhantom Rage · 082 | Phantom Rage | 082 | Common | €0.02 |
| Jack-In-The-HandPhantom Rage · 067 | Phantom Rage | 067 | Common | €0.04 |
| Jack-o-BolanIgnition Assault · 026 | Ignition Assault | 026 | Super Rare | €0.09 |
| Jackpot 7Primal Origin · 068 | Primal Origin | 068 | Short Print | $0.75 |
| Jack's KnightElemental Energy · 005 | Elemental Energy | 005 | Rare | €0.02 |
| Jack WyvernCode of the Duelist · 013 | Code of the Duelist | 013 | Common | €0.04 |
| Jade Dragon MechBurst Protocol · 082 | Burst Protocol | 082 | Super Rare | €0.21 |
| Jade Insect WhistleInvasion of Chaos · 100 | Invasion of Chaos | 100 | Common | €0.05 |
| Jade KnightCrossroads of Chaos · 037 | Crossroads of Chaos | 037 | Short Print | €0.10 |
| Jain, Lightsworn PaladinLight of Destruction · 018 | Light of Destruction | 018 | Common | $0.01 |
| Jain, Twilightsworn GeneralCode of the Duelist · 024 | Code of the Duelist | 024 | Common | €0.08 |
| Jam Breeding MachineLabyrinth of Nightmare · 026 | Labyrinth of Nightmare | 026 | Rare | €0.10 |
| Jam DefenderLabyrinth of Nightmare · 028 | Labyrinth of Nightmare | 028 | Short Print | €0.09 |
| Jar of AvariceCrossed Souls · 074 | Crossed Souls | 074 | Secret Rare | €0.08 |
| Jar of GenerosityDawn of Majesty · 080 | Dawn of Majesty | 080 | Common | €0.04 |
| Jar of GreedLabyrinth of Nightmare · 047 | Labyrinth of Nightmare | 047 | Super Rare | €2.81 |
| Jar RobberMagician's Force · 091 | Magician's Force | 091 | Common | €0.08 |
| Jar TurtleExtreme Victory · 035 | Extreme Victory | 035 | Common | $0.40 |
| Javelin BeetlePremium Pack (TCG) · 013 | Premium Pack (TCG) | 013 | Super Rare | €0.22 |
| Javelin Beetle of the AllianceUnlisted Printings | Unlisted Printings | — | — | — |
| Javelin Beetle PactPremium Pack (TCG) · 012 | Premium Pack (TCG) | 012 | Super Rare | €0.13 |
| JawsmanGeneration Force · 008 | Generation Force | 008 | Rare | €0.05 |
| Jelly CannonChaos Impact · 078 | Chaos Impact | 078 | Rare | €0.09 |
| JellyfishMetal Raiders · 072 | Metal Raiders | 072 | Common | €0.20 |
| Jenis, Lightsworn MenderThe Duelist Genesis · 025 | The Duelist Genesis | 025 | Common | €0.12 |
| Jerry Beans ManCybernetic Revolution · 004 | Cybernetic Revolution | 004 | Common | €0.13 |