I played this list in two 3-rounders over the last two days, going a total of 5-1.
https://tappedout.net/mtg-decks/07-0...?cb=1530980936
I managed to lose to Death and Taxes, but beat Bant Stoneblade, UR Delver, ANT, UB Delver, and 5C Humans.
I still have looooots of testing and tweaking to do, but I do think the deck is in a pretty good spot. The Standstills in the sideboard are the wildest choice, but they are great against fair decks. Could see playing with the pump/counterspell suites, and putting in a proper Crop Rotation package in the side. Might of Old Krosa has been impressive. Zenith was clunky, it is one of the cards on the chopping block especially if Sylvan Safekeeper isn't needed. Could see another Flusterstorm somewhere but there are enough planeswalkers and artifacts that Spell Pierce has some nice upside. The Naturalize could be a Druid's Deliverance if I keep seeing few enchantments, or another Nature's Claim if people aren't playing Chalice.
I missed playing this deck, I am having a blast. It is never easy to play optimally, but with a solid build and tight play it is powerful and tons of fun.