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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").
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.
|Raidraptor - Rise Falcon||Raidraptor - Blaze Falcon||Raidraptor - Revolution Falcon||Raidraptor - Satellite Cannon Falcon||Raidraptor - Ultimate Falcon||Raidraptor - Final Fortress Falcon|
|Cyber Larva||Cyber Dragon Core||Proto-Cyber Dragon||Cyber Dragon||Cyber Dragon Zwei||Cyber Dragon Drei||Cyber Dragon Vier|
|Fusee #1||Fusee #2||Fusee #3||Fusee #4||Fusee #5|
|Cyberdark Horn||Cyberdark Edge||Cyberdark Cannon||Cyberdark Claw||Cyberdark Keel||Cyberdarkness Dragon|
|Dark Mimic LV1||Dark Mimic LV3|
|Silent Magician LV4||Silent Magician LV8|
|Winged Kuriboh||Winged Kuriboh LV9|
|Winged Kuriboh LV10|
|Armed Dragon LV3||Armed Dragon LV5||Armed Dragon LV7||Armed Dragon LV10||Armed Dragon LV10 - White|
|Base Form||Number S|
|Number 39: Utopia||Number S39: Utopia Prime|
|Number S39: Utopia the Lightning|