first edition pokemon cards how to tell If a Pokémon Card Is Edition: 3 Signs Identifying Early Pokémon Cards
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But theyre a part of the game

[21] Believe it or not, signatures directly on cards are actually not good for their value

See rule 701.34, Proliferate. 701.34a: To proliferate means to choose any number of permanents and/or players that have a counter, then give each one additional counter of each kind that permanent or player already has

Aluren decks made extensive use of it because they could fetch any of the combo pieces other than Aluren itself, and some versions used Academy Rector allowing them to get Aluren as well