While I love the idea of four extra levels for that extra amount of clarity, I feel like 11 rarity levels is a little bit overkill. It might all be shiny and new and exciting to start with, and conceptually a great idea, but I worry that in practice it will overcomplicate the system. Especially as even with the notches on the bars, if a rainbow gradient/colour scheme is stuck to, I don't think the colours will be differentiated enough and the distinctions could become confusing.
I voted for adding 1 new category, and would be up for adding more than one tbh, but 4 seems too much. (I also don't know how it hadn't properly registered with me yet that there was no Very Uncommon category but please I need this added now for my brain

)
If more than one new category is added, I don't see the need for 2 of the 3 extra ones to be for UC/R categories - with the redistribution on top of new categories, far more pet types will have a classification of UC+ than C or below. Surely by very nature of being some form of Common, there should be more types of pets in those categories than in the UC+ ones?
For people saying more categories would help the distinction - the modelled redistribution on top of it would just push more pets into those groups and surely we'd be left with the same problem?
I'd rather see a VUC rarity with two more that would fit in below the UC rarity. (As opposed to VUC, 2 that fit above, and 1 that fits below re. the current suggestion.)
Something like 'Abundant' and 'Very Abundant' to go below C/VC (would need to change OMGSC to OMGSA in that case). We could even maybe come up with our own term that relates to CS for that extra rarity level instead of 'Abundant'!
With an *appropriate* redistribution, it should automatically create more differentiation between the 'higher' rarities regardless.
Or on a completely different tack, perhaps as well as VUC, we add two extra levels above and below OMGSR and OMGSC (was going to say just above OMGSR but my brain needed the balance

) - like 'Epic' or 'Legendary' (or even 'Rainbow Smoothie'

) that deviates from the current rainbow scheme and is just a full bar with a rainbow inside it, for the few rarest pets on the site. And if there was one below OMGSC too that had a completely different colour scheme (star at the very bottom of the bar, but maybe a more translucent filling of the rest of the bar, maybe full of leaves like the site wallpaper - could maybe be cracking the bar a little to show it's completely empty kinda thing?) then that would signify the few most common pets on the site, but also would maybe still make them desirable as they would have a completely different styling for their rarity that would look super cool!
(And also wouldn't require adding loads of new colours to the scheme, so all the categories would still be distinct.)