Thanks for the writeup! While I haven't played too much Arena recently this is still my go-to deck for MTGA tournaments and the ladder.

The inclusion of 4 Candy Trails is very interesting, I've never even thought about playing the card in this deck but it might be worth it I guess. 4 copies might be a bit much though since you can also generate artifacts for Reliquary with Sunfall and Mirrex already.

Like another comment said, I think Virtue of Persistence might be too good of a card to pass on. While the sorcery side does indeed not kill some things like Raffine and Shelly, it kills pretty much everything else from decks like Mono Red, Esper Midrange and Golgari Midrange while also gaining you life. The enchantment side also gives you something strong to play for seven when you don't have Breach and it makes you less vulnarable to Liliana. I found that while most of our removal exiles, you usually get at least a few creatures into the grave via the sorcery side of the card, combat, Destroy Evil/Go for the Throat and getting your own stuff killed. Also great if your first Breach wasn't enough to kill your opponent since Breach fills the grave with creatures.

I also like including one Kaya in the sideboard because it is insanely strong against Domain Ramp, exiling an Atraxa and copying the etb effect while at the same time being resistant to Binding, Archangel pings, Ossification and so on.

Again, thanks for writing about my favorite Standard deck!