Foil Equinox, foil Borderless, both are possible, but NOT the Commander-only cards and not the Extended Art versions of cards
Unearth is a returning mechanic that lets some permanent cards return to the battlefield one last time
Looking back to Eris, this card seems really good in builds where you can cast things often and cheap
Since you can activate Aetherflux Reservoirs ability at instant speed, players are hesitant to try and remove it or threaten you in any significant way once you have enough life to take one of them out with it

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