Having solid uncommons and commons helps even things out a bit, but even if you open way above average in terms of lower-rarity cards, it won't really make up for missing out on good mythics or foils because the good lower-rarity cards just aren't as valuable as the mythics and foils
For example, would you rather pay five mana to play a Starfield of Nyx that lets you grab threats like Chromanticore, Nighthowler, Kestia, the Cultivator every turn or cast a card like Rise Again for the same cost and only get back one creature, one time
Additionally, Illuminor works quite well with sacrifice-based deck strategies that often benefit from access to additional mana
If a WotC employee creates something for fun, its not going to resemble a regular card
Read More: The 10 Best Commanders From Innistrad: Midnight Hunt Tainted Adversary In Innistrad: Midnight Hunt, there is an Adversary cycle that all offer a different ability
They also get bonus points for being inexpensive compared to other art sleeves