Trying to balance the cube with complexity and snowballing gameplay in mind.

White

First card fits both categories

Blue

Speaking of no reminder text

Even if I cut Duelist, I am still in the market for evasive 2 mana looters in Blue, but there are none that are perfect. Malcolm is too wordy, so I'll be adding a placeholder.

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Daze is an iconic card and one I am a fan of. However, there are two strikes against it.
One, it breaks my unwritten rule for free interaction because it costs you a single card. Returning an Island isn't nothing, but it certainly isn't a full card.
Two, it's at its best when you are ahead and will cement your advantage. The Dimir tempo decks in the cube are already the best (cheap threats, hand and stack interaction, solid card draw, ...) and Daze shines brightest in those shells. I might come around on this change, but for now it's out.

I still enjoy free spells though, so in comes Subtlety as a good beater and a piece of interaction that will still be premium in those tempo shells, but can also be used in a combo deck with draw 7s or a blink deck for example.

Red

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Next, we have a decent but super wordy card in Glimpse the Impossible and my last remaining DFC with Fable. I'll be going single-sided for now, but just like with Parallax Wave, I could see changing my mind (and adding Sink into Stupor).

Fable gets replaced by Triumph which should play well with Welders especially with the option of giving haste. Glimpse gets replaced by the equipment which fits in perfectly with all the spell velocity built into the cube.

Green

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I'm a fan of the Guardian, but it's the only instance of Blitz in the cube. I've found a side grade that will play different, but has similarities. The Badger trades the burst damage and combo potential (Guardian + Hogaak + Altar of Dementia) for a steady source of tokens and more mana generation. The card draw from Blitz is replaced by the Adventure mechanic. I'm not married to this slot though, so this could end up as an entirely different card down the line.

I want more 2 mana flyers and Spirit is great because it protects high impact 3 drops (Kiora, Tracker, Soultrader, …).

Priest is hate and synergy in White.

Provisioner and Ivora reward you with tons a trinkets and aren’t restricted by any clause.

Asmo is a hybrid for the discard deck.

Station is offers a combo finish in the right shell or can set you up nicely. Being colorless helps White with Phlage for example which I think is important.

Cheaper interaction and cutting the only instance of incubate.

Trying out a bounce theme to give White more options at synergy. This comes at the cost of cutting a lot of cards I love, so it's likely I change things up as I test.

Trying a little hate bear package in White.

For some reason, I've mutually excluded Gravecrawler and other fodder cards. Forsaken Miner is a great one though that is cheap to recur and easy to trigger.