It's also worth noting what a bad and unpopular place standard was in when they created the challenger decks last year. Many saw the challenger decks as a desperate attempt to jump start some interest in a standard maligned by Kaladesh and Amonkhet's high power levels and multiple format changing bannings. Current standard by comparison is seen by many as a healthy and popular format, so there is less of a need to super-load these with value.
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