(There was a time when there was no maximum limit, which swiftly changed after someone entered a German tournament with a 2000+ card deck.) A tournament deck will always be 40 cards because the fewer cards you have, the more likely you are to draw the ones you want
But when we focus the environment on creature types, these cards start becoming playable, especially in limited
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In their heyday, they inspired such unprecedented moves as the first balance-motivated ban in Vintage, a card being preemptively banned in Commander prior to release, and an entire mechanic being significantly reworked via official errata
[1] The game coexists independently alongside Magic Online
Theres no such thing as Google, as the search engine so ubiquitous to life today wasnt introduced to the public until September of 1998