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Unexpected Windfall earns its place by drawing the player two cards and generating two treasure tokens (which tap and sacrifice themselves to generate one mana of any color each)

That manufactured scarcity leads to a price point close to $400 in todays market

While that's not the most terrible idea, the likelihood in a Niv-Mizzet deck is that the other spell you're casting is a burn spell that could do the same, and I have to feel that you're going to be better off casting it by itself, rather than putting all your eggs in one basket

A third Echoes of Eternity causes such abilities to trigger four times, a fourth causes such abilities to trigger five times, and so on

What affects the value of Golbez, Crystal Collector