So why do I think Eidolon of Countless Battles is a sleeper hit
One double-faced premium-foil token included
There was a sweet spot for balancing the "hero" decks in the original Archenemy that often required a little bit of iteration to nail down, but now you can go straight into balanced four-player Archenemy games right of the box
It still has a place (mostly driven by nostalgia, probably) in dredge decks like Jarad, Golgari Lich Lord, and you absolutely have to run it on principle in Saffi Eriksdotter and Hans Eriksson decks
As such, you wont find them in any of the main four Commander decks
Unfortunately, standard can't hold the value of this card on its own, so it looks like Nissa of Shadowed Boughs will have a hard time maintaining its current price