In:
Golden Wish can't be good right, 5 mana? Well, let's try it.
Pemmin's Aura is in alongside two cards that make infinite mana with it - Krosan Restorer and Argothian Elder. Braingeyser in alongside them for a good mana outlet. I love that all these cards are good on their own. Bad thing is that this combo isn't popular so drafters may not see it.
Tighten up black with cards better in a wider range of decks.
Trying out Phage the Untouchable. The only two combos with it are Volrath's Shapeshifter and a reanimate + stifle. Not great, but I love how it lines up with the same cards that combo with Phyrexian Dreadnought.
Rogue Kavu seems bad, but it could be fine. Red 2cmc is a constant struggle.
We've had some big red decks show up lately, so I wanted to put some extra support in for it. I'm excited to see how it turns out.
With the land untappers in for the Pemmin's Aura combo, I wanted to try out Quirion Ranger too. She doesn't seem like she'd fit in every deck, but when she does, she will be great. Priest of Titania in for the dream curve with Ranger.
Mulch in to help support the threshold, gy archetypes.
Trying out Centaur Chieftain. It saw some tournament play back in it's time. Certainly not a bad base rate.
Void is sweet. I think it may fit in more decks in this iteration.
Cathodion and Su-Chi go infinite quite easily with Enduring Renewal. They aren't bad rates either and go well in the artifact deck.
Mindless Automaton is nice is with damage on the stack. A discard outlet too. This robot could be nice.
Jinxed Idol seems good for punishing the often-strong, low-creature count decks. I think this will fit well in many aggressive decks.
Bringing back in the slow-fetches after a long while on the bench. We will see how they play out only have the allied colors.

Out:
Resilient Wanderer is a fine discard outlet, but 4 mana isn't usually where you want it.
Trying to focus most of the artifact deck support to just colorless.
Zulaport Cutthroat was nice, but didn't really fit the feel of the cube well.
Festering Goblin was fine, never exciting.
Nester Shambler not really needed.
Stronghold Assassin didn't feel like a great payoff for having sac fodder since it wasn't great in all matchups.
The Abyss was good, but it isn't always needed in the cube.
Yawgmoth's Bargain just wasn't working well in this iteration. Storm leaning more blue.
Dwarven Miner was fine, but two of the effect wasn't needed.
Blast-Furance Hellkite was perfect for the job of giving the artifact deck a better kill card and a sneak target. Just didn't really fit the feel.
Faithless Looting not really needed.
Stronghold Gambit was funny, but bad. It was nice sleeving it up.
Devastation was good, but it isn't always needed in the cube.
Green ramp switched out for similar cards.
Why do I keep adding Ravenous Baloth back in? He taunts me. The 4 slot for green ain't great, but he ain't it.
Saproling Cluster and Fecundity were fun, but not great. They got play on their own, but felt underwhelming.
Sterling Grove was good and it will definitely be back someday. I like how it is a signpost for the deck. Just wanted the GW count lower and this is parasitic.
Thopter Squadron always plays out fine. I wish it were a little stronger.
Thorn of Amethyst and Mishra's Helix cut, too many hate cards.
Altars are out. They were fine, but fit in few decks.
Bottled Cloister was good, but Grafted Skullcap is true old-border and plays a similar role.
Trading Post is out :( I love this card, but it doesn't fit the feel that well.
The more niche lands are out to make room for the slow-fetch lands. I liked all of these.