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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]]").{{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.
