Card evolutions

Card evolutions, or retrained monsters, is the term used to describe a monster that has been reprinted with a new effect and slightly different name, but with the same base ATK and DEF, and usually Level and appearance as well. Examples include "Battle Ox" to "Enraged Battle Ox" and "Magician of Black Chaos" to "Dark Magician of Chaos". Special cases are "Harpie Lady 1", "Harpie Lady 2", and "Harpie Lady 3", which all have the same stats as the original "Harpie Lady", but are not all representing the same creature. Rather, they are the three sisters from "Harpie Lady Sisters".

The term "retrained" comes from "Retrained Elf Swordsman," a deliberate mistranslation of the Japanese name for "Obnoxious Celtic Guard", who is a retrained version of "Elf Swordsman" ("Celtic Guardian").^{[citation needed]}

Retrained monsters are not to be confused with upgraded ones, such as "Cannon Soldier MK-2". These, like retrained monsters, are clearly based on existing cards. However, unlike retrained versions, these have higher ATK and/or DEF and an effect meant to improve upon the original.

Retrained cards

Original	Retrained
Ancient Gear Gadjiltron Dragon	Ancient Gear Reactor Dragon
Ancient Gear Golem	Ancient Gear Golem - Ultimate Pound
Baby Dragon	Red-Eyes Baby Dragon
Battle Ox	Enraged Battle Ox
Black Luster Soldier	Black Luster Soldier - Envoy of the Beginning Black Luster Soldier - Envoy of the Evening Twilight Black Luster Soldier - Sacred Soldier Black Luster Soldier - Super Soldier
Blue-Eyes Ultimate Dragon	Neo Blue-Eyes Ultimate Dragon
Blue-Eyes White Dragon	Blue-Eyes Alternative White Dragon
Buster Blader	Buster Blader, the Destruction Swordmaster
B. Skull Dragon	Archfiend Black Skull Dragon
Celtic Guardian	Obnoxious Celtic Guard
Cocoon of Evolution	Super Cocoon of Evolution
Curse of Dragon	Curse of Dragonfire
Dark Blade	Dark Blade the Captain of the Evil World
Dark-Eyes Illusionist	Millennium-Eyes Illusionist
Dark Magician	Magician of Dark Illusion
Dark Magician Girl	Apprentice Illusion Magician
Doll of Demise	Malice Doll of Demise
Doriado	Elemental Mistress Doriado
Dunames Dark Witch	Power Angel Valkyria
Elemental HERO Neos	Elemental HERO Honest Neos
Fortress Whale	Citadel Whale
Gaia the Dragon Champion	Sky Galloping Gaia the Dragon Champion
Gaia The Fierce Knight	Arisen Gaia the Fierce Knight Charging Gaia the Fierce Knight Lord Gaia the Fierce Knight Swift Gaia the Fierce Knight
Gearfried the Iron Knight	Red-Eyes Metal Knight Gearfried
Giant Orc	Tardy Orc
Giant Soldier of Stone	Sentry Soldier of Stone
Harpie Lady	Harpie Lady 1
Magician of Black Chaos	Dark Magician of Chaos
Marauding Captain	Marmiting Captain
Meteor Dragon	Meteor Dragon Red-Eyes Impact
Meteor B. Dragon	Meteor Black Comet Dragon
Number F0: Utopic Future	Number F0: Utopic Future - Future Slash
Parasite Paracide	Parasite Paranoid
Raidraptor - Revolution Falcon	Raidraptor - Revolution Falcon - Airraid
Red-Eyes B. Dragon	Red-Eyes Black Flare Dragon
Saggi the Dark Clown	Peten the Dark Clown
St. Joan	Guardian Angel Joan
Summoned Skull	Red-Eyes Archfiend of Lightning Skull Archfiend of Lightning
Spiral Serpent	Phantasm Spiral Dragon
Swordsman of Landstar	Comrade Swordsman of Landstar
Super Conductor Tyranno	Ultimate Conductor Tyranno
Ultimate Tyranno	Ultimate Conductor Tyranno
Thousand-Eyes Restrict	Millennium-Eyes Restrict
Troop Dragon	Soldier Dragon
Tuning Magician	Harmonizing Magician
Vorse Raider	Kaiser Vorse Raider