I enjoyed drafting your cube. I noticed that you have included very few lands, with the result that a typical two color deck will only play one, and three color decks are likely unfeasible. If this was your intention, I would recommend cutting lands all together as their current impact is minimal for the space they occupy.
If you are intetested in improving players' access to fixing, consider a mix of the following:
- Add more lands. A good rule of thumb for minimum fixing is at least 10% of the cube, or 18-20 for 180 cards.
- Replace dual lands with trilands or thriving lands. Replacing 10 duals with 10 trilands triples your mana fixing, as each color pair appears three times rather than once. Thriving lands (and the new gates that do the same thing) are even better and would be my recommendation if you only run 10 lands, provided you don't mind the tracking that they entail.
- Consider lands that any player can take. The Thriving lands already fit this category (you can take off-color ones to play as Shimmerdrift Vales), but other suggestions would be Evolving Wilds/Terramorphic Expanse, Ash Barrens, Mirrodin's Core, or Cryptic Spires (though again with extra tracking).
Vesperlark --> Mentor of the Meek
Murmuring Mystic --> Whispering Wizard
Night Clubber --> Nekrataal
Oona's Gatewarden --> Far // Away
Stun Sniper --> Honored-Crop Captain
Vesperlark was meant to support white aggressive decks in both pressuring and creature/card advantage, but an evasive creature with a leave effect ended up being awkward in play. Mentor provides the same advantage at the same CMC while also being grounded.
Murmuring Mystic and Night Clubber ended up being absolute hosers against other archetypes. The former was too fat and had too valuable of an effect and as such would outcompete other midrange or halt aggro while being difficult in many cases to get rid of. The Latter was simply too strong for a peasant cube with many X/1s and X/2s and could often act as a one-sided wipe or too advantageous of a combat advantage. Whispering Wizard provides the same Mystic value while being easier to remove. Nekrataal provides a classic, pressuring creature removal that is more limited to play than blitzing clubber.
Finally, Oona's Gatewarden and Stun Sniper ended up being rather lackluster and unexciting picks for all of their respective colors. Gatewarden is being replaced with a fan favorite fuse card that is great used only on either side and Crop-Captain takes a seat next to the well-liked Accorder Paladin.