Things that we want to see in Limited or casual Constructed but usually not in multiples for complexity reasons tend to go into uncommon
A Reliable LED Flashlight: A strong, focused light source is required for checking the inner construction of the card
Considering that the character has six health and that the amber ink type is now well populated with a litter of cheap dalmatian puppy cards, you can really put Perdita, Devoted Mother to work
Since less-supported types also tend to have fewer creatures in their card pool overall, they might have certain blind spots on their mana curve or list of key effects, and they probably cannot produce many on-type creature tokens to most efficiently benefit from team-wide buffs
Bang on
In fact, he achieved a rare feat: he collected a full set of thirteen warlocks, all of them descended from one of the first thirteen warlocks who made pacts with Asmodeus, the ruler of the Nine Hells