Countless years ago, in his quest for ever-increasing pain, he managed to catch a cellarspawn and extract its essence to inject into himself, hoping that infusing himself with pure fear would inflict an agony upon him that no one had ever felt before
A location being banished does not affect the characters that are there, unless a card specifically mentions it
I think hes right, especially when it comes to flavor and the recent Doctor Who set is a perfect example
There's tons of other fun cards too, like giving Skullbriar an easy +9/+9 with Belt of Giant Strength, growing him while taking out threats with Ruinous Intrusion and Astarion's Thirst, or wiping out opposing creatures with Find // Finality
Anything from mass-land reanimation, artifact-token aristocrats, or even Maskwood Nexus-fueled Squirrel armies work well under Camellia's banner, making this Bloomburrow legend an exciting build around general
If you are interested in running this package, the key is to find a good home for it in the current metagame