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For two mana, you can force an opponent to mill ten precious cards (or at least burn an MTG counter spell to prevent this)

Its a powerful effect if you can leverage it better than your opponents, but Id be wary of chucking this in any old list

The copy created by Echoes of Eternity's last ability is put directly onto the stack

Braingeyser will let you refill your hand as needed at this point, and you should be able to generate infinite mana, infinite Shivan Dragons, or the opportunity to fire off infinite Braingeysers at your opponents

The tricky thing is that formats regularly remove cards from Standard every few years, typically in the Fall

I think the best case scenarios mean that theres room for Sidisi, Undead Vizier as a singleton copy since its also a good Whip of Erebos target, but not much beyond that