Magic: The Gathering color-codes cardboard value
Figuring out if you pulled a valuable card used to require an encyclopedia, until Wizards of the Coast revolutionized dopamine hits with a simple gradient. By color-coding expansion symbols—black for common, silver for uncommon, gold for rare—they created a universal, instant visual cue for rarity. This tiny UI change completely rewired the unboxing experience, turning card packs into miniature slot machines.

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