Thoughts on the art/ench destruction wish target? Main options seem to be either
viridian shaman or
viridian zealot.
Pros for
viridian shaman: one mana less to destroy artifact, and its a triggered ability so it gets around things that prevent activated abilities (though there aren't many)
Pros for
viridian zealot: can destroy enchantments too
I've also heard
sylvok replica suggested specifically for ethersworn canonist, so you can wish it and play it in the same turn. Probably not worth it for this specific case though, unless canonist sees a lot more play.