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As a note, Archmage of Echoes is one of the many new Faerie Typal cards released in the Fae Dominion preconstructed deck
However, some cards take those and add an entirely new twist using with the magic of the Great Illuminary Characters and Locations have a name and a version of the character describing them
Ichor Wellspring ain't no proper egg in that sense (it has no built-in sacrifice ability), but assuming your deck hangs out with an entourage like Braids, Arisen Nightmare or Daretti, Scrap Savant and you can reanimate artifacts, you can draw a lot of omelets with this one
With more than two, you'll begin to notice problems
In casual play, many groups are fine with proxies as long as everyone agrees up front.