Just because it's an ETB removal effect doesn't mean you can remove the activation cost on Pridemage and call it a day. The closest benchmark for an ETB artifact destruction 2 drop would be Tin Street Hooligan. Your card is much, much better than Hooligan, and Hooligan already saw some Vintage/Legacy play.
It needs to either have a

kicker for the ETB effect, or not have exalted, or be a 1/1.
To be fair, it does directly compare to Leonin Relic-Warder. Although I do not think that it's fair to omit the LTB condition; if it's going to exile the artifact forever, definitely get rid of Exalted.
Agreed, it's pretty much a copy of Warder, but with Exalted and no leave play.
That said, I don't think it's that overpowered, it COULD see print, but it wouldn't because it's so uninspired. Just a mix of 2 cards people already use, nothing really interesting from design standpoint. If you change P-T, it becomes Hooligan, leave Exalted, and it's Pridemage. Just boring.
Why not go wild with it instead? Suggestion...
Artifact hater dude
1GW
If an opponent controls 3 or more artifacts, you can play Artifact Hater Dude for 0 and as though it has Flash.
When enters battelfield, exile artifact,
2/2