Zombie, Fiend, or Spellcaster
Wightprince
Zombie
This first word of a five-star Dragon's name is currently the longest on record - even if it is made-up.
Interpletarypurplythorny
One of MTG's lands shares a name with this extremely-old YGO field spell.
Mountain
JUDGE! My opponent claims their Dark Jeroid is a part of this GX archetype! Tell them to go back to the chop shop!
Roids
The Draco Constellation serves as the inspiration for this Ritual archetype - including its stars Alpha, Beta, and Gamma.
Drytron
Miasma Necromancer
Spellcaster
The Rail Cannons - Liebe, Dora, and Gustav - all share this prefix.
Superdreadnought
This fourth-edition instant destroys a creature or land - MUCH less powerful than YGO's famous removal spell for the lowest-attack monster.
Fissure
JUDGE! My opponent is trying to Ash Blossom my floodgate! Tell them I'm not trying to use this card to summon!
Macro Cosmos
YGO's referenced the Kabbalah like... a dozen times, most famously on Oracle of Zefra and through these monsters, played by Z-ONE.
Timelords
Dark Spirit of Banishment
Fiend
DAILY DOUBLE
Lightningstrike
This blue enchantment allows you to use yourr influence to take an opponent's monster - and shares a name with YGO's less-good Change of Heart.
Mind Control
JUDGE! Why can't I use this Synchro monster's effect to negate Snipe Hunter! It'll MOST LIKELY destroy - isn't that enough?
Stardust Dragon
Vampire Hunter is a subtle reference to this Konami franchise - though his whip really gives it away.
Castlevania
Ghostrick Jiangshi
Zombie
Predaplants are famous for their unbelievable compound names - including this one, which features on their five-star fusion.
Ambulomelides
This YGO-banned equip spell has a text match in MTG - but Magic's destroys instead of reanimating.
Premature Burial
JUDGE! My opponent called this card with Mind Crush and tried to send my Legendary Ocean and Pacifis! Tell them they whiffed!
Umi
This XYZ monster was based on the Antonov An-225 Mriya - the heaviest aircraft with the longest wingspan ever built. I guess that's why it used to be so expensive.
Mecha Phantom Beast Dracossack
Ryu-Kishin Clown
This word, immediately following D/D/D/D in the longest card name ever, is hyphenated. It still counts!
Super-Dimensional
This Edison-Legal combo piece has a MTG analogue, though giving your Zombies swampwalk isn't particularly powerful.
Zombie Master
JUDGE! I De-Fusioned this Super Polymerization target - why can't I summon the monsters back? What do you mean they have to be on the field?
Starving Venom Fusion Dragon
Aistu, Koitsu, Soitsu, and Doitsu are playable characters from this Gradius knock-off.
Parodius