Streets of New Capenna

Boon of Safety
One-Drop Cubelet contender to protect one of your creatures and possibly control the opponent's next draw.

Depopulate
Draw a card and board wipe, nice alternative to some of the other board wipes out there

Inspiring Overseer
Nice little consideration for a Pauper cubelet. Or a blinking matters cubelet for that matter.

Rumor Gatherer
Scry is powerful in Cubelet, but if you are going wide, you get rewarded by drawing the card.

Expendable Lackey
Can't be blocked when you only have so much life to contend with in One-Drop Cubelet sure will be interesting.

Hypnotic Grifter
3 mana to connive is a steep cost, but the One-Drop Cubelet could always have mana sink rewards.

A Little Chat
Nice way to scrap a token or something for more cards.

Reservoir Kraken
It's like a Desecration Demon, but different. Might be hard to remove, but think of the fishes you'll likely get.

Slip Out The Back
Otherworldy Journey is already exceptional, this is a mana cheaper. Also a one-drop contender.

Witness Protection
A very cheap way to turn off the abilities of creatures.

Cuthroat Contender
If you're up on life, you have opportunity to close out the game by doing an extra point of damage. One-Drop contender.

Grisly Sigil
One-Drop Cubelet contender. With the low starting life, gaining one back (potentially 2) is significant and can help clean up the board.

Sanguine Spy
Early game control of the top of the deck into late game drawing cards. Deal.

Shakedown Heavy
Interesting subgame can be created, also a decent way for you to potentially draw cards.

Tenacious Underdog
Scrapheap Scrounger is just better for Cubelet, but this is a neat alternative.

Goldhound
First Strike AND Menace? What a One-Drop!

Light 'Em Up
A pauper cubelet might be interested in this. The sacrifice to clean up smaller threats or combine together to take out a bigger threat is tempting.

Professional Face-Breaker
Everything about this card screams Cubelet. Neat card.

Sticky Fingers
Menace, more mana, and draw a card when it dies. A neat little enchantment.

Strangle
The problem with Lightning Bolt is that it can go to the face and wipe out half a person's life in One-Drop Cubelet. Strangle fixes that problem.

Unlucky Witness
One-Drop Cubelet Contender. It dies, you get to replace it.

Cabaretti Initiate
One-Drop Contender. Another mana sink reward.

Gala Greeters
Unsuspiciously wonderful. It's like an upgraded Quirion Dryad.

Luxurious Libation
Technically a one-drop for the One-Drop Cubelet. Mana sink to win or play it light and reload with a body.

Charm Cycle
Rather than list them all individually, let's just say they are all good options.

Scheming Fence
This is funny and what Cubelet can be about.

Corpse Extraction
An interesting board wipe that also takes out a creature card from the graveyard.

Void Rend
If you happen to play a bunch of counter spells in your cubelet, this is a nice upgrade to Hero's Downfall, but otherwise, this is basically a second copy that can also hit enchantments/artifacts.

Fatal Grudge
Rid of pesky noncreatures by sacrificing your own, otherwise, it's everyone sacrifices a creature and you get to draw a card. Not bad.
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Cement Shoes
Interesting subgame in the One-Drop Cubelet. Unsure if this is playable anywhere else.

Luxior, Giada's Gift
If you're playing planeswalkers in your cubelet, this is easy. This could also be an interesting include in a "counters matter" cubelet.