It can be an artifact on both sides, an artifact that transforms into a non-artifact, or vice versa with an artifact only on the back half
Ezuri, Stalker of Spheres does draw you a card whenever you proliferate, which is a fair rate for the advantage generation, but itll just serve you better as a complement to your consistent proliferates from Atraxa, Praetors' Voice
It even gives us extra value from Epiphany at the Drownyard
Considering how much the ink versions are already going for, I can't imagine how much the Gold Foil variant would actually be valued at, maybe you just win at money and never have to pay for Magic cards again, now that would be nice
It was also a highlight for me that we both picked cards originally from Portal Three Kingdoms and reprints with Richard Kane Ferguson art