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The Commander format wasnt a big thing back then, and neither were black devotion decks

Along with that, it also has Vigilance, Trample and Haste - which means it can not only attack the turn it comes in, but also defend even if it does attack

This deck offers the same or lesser value than the other decks, but people are charging twice as much for the precon

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)

Laelia, the Blade Reforged not only grows whenever it exiles cards from your library while attacking, but also when cards leave your graveyard