I like the synergy between Wild Growth and the bounce lands with Voyaging Satyr
I didn't like the double pipped cost of Sap Vitality
Deep Forest Hermit might be too good and I like how Deranged Hermit can go to the graveyard faster which is better when you're recycling your deck
A-Esika's Chariot bothered players, while I think the printed version is too good. Kazandu Tuskcaller seems high variance, Opening Ceremony bothered players as well as Arcane Savant. Many of the additions are lower MV. I enjoyed playing with Sphinx of Foresight in the DNC
Also: mild alterations to Piracy Charm, Research // Development, Flesh Carver, Extract, Dreadhorde Invasion, and a reworking of Dimir Charm
"Prismatic Vista" (custom equivalent) helps with colorfixing and adding permanents to your deck.
Nested Shambler, Ravenous Squirrel, and Urabrask's Forge are all more synergistic.
Ephemerate was too strong
Emissary's Ploy was in a lot of powerful decks
Cryptic Spires was annoying to track
Seasons Past was never played (too expensive)
Jinxed Choker goes against my goals by taking over the game by itself and ending the game before players can get their engines going.
Cutting some cards that are never played as well as adding to the squirrel and zombie synergies and blink
Time Walk had too many infinite combos and Daze was too powerful as a free spell
Pest Infestation and Sovereign's Realm were too powerful
Experimenting with fixing lands (reflecting pool, Thriving, Vivid, Cryptic Spires)
Removing some low power cards (slow motion, Tamiyo, You're in Command
Hymn of the Wilds was too powerful
Book Burning was too high variance based on when you drew it and Smallpox was never played.
Trying to reduce the number of board wipes, thus removing Nevinyrral's Disk
Adding a Squirrel package (Deep Forest Hermit + Chitterspitter + Acorn Catapult)
Ghyrson Starn, Kelermorph may be a fun build around
Trying out Ancestral Recall and Time Walk to see if they're broken (there may be too many combos with Time Walk)
Replacing some of the power outliers:
Added cards to potentially add new archetypes (Zirda, the Dawnwaker, Krark, the Thumbless, Grateful Apparition, Blood Artist + Goblin Bombardment, Nettlecyst)
Trying out a Thriving land