The faction has many tools against high life targets, but it has some troubles punishing multiple low life units. Casimira however feasts on low life commons.
There isn’t much to say other than if there are a lot of low life commons to destroy, Casimira is extremely efficient and should be summoned. Even against 3 or 4 life commons, Casimira can be pretty good when supported with a Sacral Priest once she gets damaged. However, in most cases when possible the opponent will try to focus fire on her and thus being damaged, well positioned, and also adjacent to a Sacral Priest, is not an easily arranged set up.