Cards are categorized into ink types (and each ink is designed with a basic strategy in mind), but they are all designed to win

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I think that cultural cachet speaks to the compelling flavor of the spell
Though expensive, it can cut a players life total from 40 to single digits with ease, and potentially even wins the game if combined with a board wipe
At worst, its a three-mana way to stop a player until they find a disenchant, which can be enough to help you get to the win yourself
Grand Arbiter Augustin IV (SL Fallout foil $5) People kill this blatherer on sight, because its annoying, but when a card is good, it gets targeted