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".

Retrained cards
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").

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.

Archetype

 * /Assault Mode
 * Malefic
 * Metaphys
 * Toon

Counterpart

 * Dark
 * Metal
 * Zombie

CXyz
<!-- Unlisted
 * Aussa the Earth Charmer → Familiar-Possessed - Aussa → Avalanching Aussa
 * Codarus → Levia-Dragon - Daedalus → Lightray Daedalus/Ocean Dragon Lord - Neo-Daedalus
 * Constellar Rasalhague → Evilswarm Kerykeion → Shaddoll Zefranaga
 * Dharc the Dark Charmer → Familiar-Possessed - Dharc
 * Diabolos, King of the Abyss → Lightray Diabolos
 * Dragard → Black Dragon Collapserpent → Darkflare Dragon
 * Dragon Horn Hunter → Dragon Core Hexer
 * Dunames Dark Witch → Dark Valkyria
 * Elemental HERO Bladedge → Evil HERO Malicious Edge → Evil HERO Malicious Fiend
 * Elemental HERO Gaia → Evil HERO Dark Gaia
 * Elemental HERO Rampart Blaster → Evil HERO Infernal Sniper
 * Elemental HERO Thunder Giant → Evil HERO Lightning Golem
 * Elemental HERO Wild Wingman → Evil HERO Wild Cyclone
 * Eria the Water Charmer → Familiar-Possessed - Eria → Raging Eria → Gishki Ariel → Ariel, Priestess of the Nekroz/Evigishki Mind Augus (w/Gishki Reliever)
 * Evening Twilight Knight → Black Luster Soldier - Envoy of the Evening Twilight
 * Field-Commander Rahz → Dark Crusader
 * Gandora the Dragon of Destruction → Gandora Giga Rays the Dragon of Destruction
 * Gem-Knight Crystal → Gem-Knight Prismaura (w/Vylon Prism)/Cairngorgon, Antiluminescent Knight → El Shaddoll Grysta/Shaddoll Core → Shaddoll Zefracore → Zefraath
 * Gigobyte → Jigabyte → Gagagigo → Giga Gagagigo → Gogiga Gagagigo → Gagagigo the Risen
 * Gishki Avance → Evigishki Levianima (w/Gishki Emilia)/Great Sorcerer of the Nekroz → Nekroz of Unicore (w/The Fabled Unicore)/Nekroz of Valkyrus (w/Fabled Valkyrus)/Zefrasaber, Swordmaster of the Nekroz
 * Gishki Emilia → Evigishki Gustkraken (w/Gusto Falco)/Evigishki Levianima (w/Gishki Avance)/Evigishki Merrowgeist (w/Musto, Oracle of Gusto)/Dance Princess of the Nekroz → Nekroz of Gungnir (w/Gungnir, Dragon of the Ice Barrier)/Nekroz of Sophia (w/Sophia, Goddess of Rebirth)
 * Gishki Noellia → Gishki Psychelone/Evigishki Tetrogre (w/Vylon Tetra)
 * Gishki Shadow → Evigishki Soul Ogre/Evilswarm Ketos
 * Gladiator Beast Bestiari → Gladiator Beast Gyzarus
 * Gladiator Beast Laquari → Gladiator Beast Heraklinos
 * Gladiator Beast Spartacus → Gladiator Beast Gaiodiaz
 * Green Baboon, Defender of the Forest → Yellow Baboon, Archer of the Forest → Ancient Crimson Ape
 * Guardian Eatos → Guardian Dreadscythe
 * Gungnir, Dragon of the Ice Barrier → Evilswarm Ophion/Nekroz of Gungnir (w/Dance Princess of the Nekroz)
 * Hand of Nephthys → Sacred Phoenix of Nephthys
 * Hieratic Seal of the Dragon King → Hieratic Dragon King of Atum
 * Hieratic Seal of the Sun Dragon Overlord → Hieratic Sun Dragon Overlord of Heliopolis
 * Infernalqueen Archfiend → Imprisoned Queen Archfiend
 * Inpachi → Blazing Inpachi → Charcoal Inpachi → Woodborg Inpachi
 * Insect Princess → Insect Queen
 * Jiaotu, Darkness of the Yang Zing → Zefraxi, Treasure of the Yang Zing
 * Kagemusha of the Six Samurai → Kagemusha of the Blue Flame → Shadow of the Six Samurai - Shien
 * Kamui, Hope of Gusto → Ritual Beast Tamer Elder → Ritual Beast Ulti-Cannahawk (w/Spiritual Beast Cannahawk)
 * Kattapillar → Cocoon of Evolution → Larva of Moth → Pupa of Moth
 * Lady of Faith → Doriado → Elemental Mistress Doriado → Shadowpriestess of Ohm
 * Lava Dragon → Magma Dragon
 * Legendary Six Samurai - Enishi → Enishi, Shien's Chancellor
 * Legendary Six Samurai - Kageki → Chamberlain of the Six Samurai
 * Legendary Six Samurai - Kizan → Grandmaster of the Six Samurai
 * Legendary Six Samurai - Mizuho → Hand of the Six Samurai
 * Legendary Six Samurai - Shien → Tenkabito Shien → Great Shogun Shien
 * Legendary Six Samurai - Shinai → Spirit of the Six Samurai
 * Magician's Valkyria → Dark Magician Girl → Dark Magician Girl the Dragon Knight/Magi Magi ☆ Magician Gal
 * Mist Valley Thunderbird → Mist Valley Apex Avian → Evilswarm Thunderbird
 * Outstanding Dog Marron → Mad Dog of Darkness → Skull Dog Marron → Mecha-Dog Marron
 * Psychic Kappa → Kappa Avenger → Hyosube
 * Ryu-Kishin Clown → Ryu-Kishin → Ryu-Kishin Powered
 * Second Goblin → Coach Goblin → D.D. Trainer
 * Simorgh, Bird of Divinity → Simorgh, Bird of Ancestry → Dark Simorgh
 * St. Joan → Guardian Angel Joan/Noble Knight Joan
 * Steelswarm Roach → Evilswarm Exciton Knight → Stellarknight Zefraxciton
 * Super Vehicroid - Stealth Union → Super Vehicroid - Rex Union
 * Tatsunoko → Coral Dragon
 * The Black Stone of Legend → Black Dragon's Chick → Red-Eyes Baby Dragon → Red-Eyes Wyvern/Red-Eyes Retro Dragon → Red-Eyes B. Dragon → Red-Eyes Darkness Dragon → Red-Eyes Darkness Metal Dragon
 * The Creator Incarnate → The Creator → The Dark Creator
 * The Masked Beast → Masked Beast Des Gardius
 * The White Stone of Ancients → The White Stone of Legend → Paladin of White Dragon → Blue-Eyes White Dragon → Azure-Eyes Silver Dragon/Blue-Eyes Shining Dragon/Blue-Eyes Tyrant Dragon/Legendary Dragon of White/Blue-Eyes Twin Burst Dragon → Blue-Eyes Ultimate Dragon → Dragon Master Knight
 * Three-Legged Zombies → Uni-Zombie
 * Thunder Dragon → Twin-Headed Thunder Dragon/Thunder End Dragon → Thunder Dragon Colossus
 * Transforming Sphere → The Atmosphere
 * Tribe-Infecting Virus → Tribe-Shocking Virus
 * Twinbarrel Dragon → Blowback Dragon → Barrel Dragon → Desperado Barrel Dragon/Gatling Dragon
 * Ushi Oni → Giant Ushi Oni
 * Vector Pendulum, the Dracoverlord → Lector Pendulum, the Dracoverlord → Amorphactor Pain, the Imagination Dracoverlord (w/Amorphage Goliath)
 * Warrior of Zera → Zeradias, Herald of Heaven → Angel of Zera → Archlord Zerato → Darklord Zerato
 * Warrior of Zera → Mazera DeVille
 * Warrior of Zera → Zera the Mant

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