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That's probably why WotC leaned towards Treasure: Gold allows you to double-dip in case some other effect requires you to tap permanents (because you can tap your Gold to pay for that other effect, and then still sacrifice the Gold for mana in the same turn)

Its a Ghost Rare card, which is a special treatment that has a slight split to two layers of the Monster it features, making it appear almost three dimensional

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And some players may lose interest in playing

Often times rare cards have standard and holo versions, or only reverse-holo and holo versions