Proxies don't exist in Artifact. That's the point.
If you’ve ever been involved in competitive Magic: The Gathering, there’s a decent chance you’ve encountered what’s known as proxy cards. Playing Magic seriously is an expensive endeavor, and a competition-ready deck can set you back $1,000 or more. So, if you want to play—but not pay—like a pro, you use a proxy card: A homemade simulacrum of a costly, unowned card that, with two players willing to shake on it, stands in for the real thing. They aren’t strictly legal, but they are pervasive enough to be accepted (one online tool will even print an entire deck of them for you). And, in any case, Magic publisher Wizards of the Coast’s provision against proxies is about as impotent as the “don’t remove this tag” message on your pillow. As a result, proxy cards have become part of the experience of competitive Magic. Whether you’re just getting into the scene, or a serious player testing out new permutations of cards, proxies offer something akin to the “real” experience without the financial burden.
This is a companion discussion topic for the original entry at https://waypoint.vice.com/en_us/article/j5za97/artifact-isnt-a-game-on-steam-its-steam-in-a-game