What value is there in keeping multiples of the same mirage?

What value is there in keeping multiples of the same mirage? - Blackboard with YOUR LIFE MATTERS inscription on black background

I have been playing a while now and have tried my best to imprism every mirage I've found. However this has lead me to have multiple mirages which are transfigurations of existing mirages. Such as Chocochick and Black Chocochick.

Not quite understanding transfigurations, I have levelled them all individually. Today I discovered that actually Black Chocochick is a transfig of Chocochick. This means that I can change my existing Chocochick into a Black Chocochick as and when I want, and keep all it's existing abilities.

I have similar situation with Floating Eye, Arhiman and Blood Eye. These are all transfigs of the same mirage, but now I have three levelled versions of the same mirage, all able to transfig between these forms.

The obvious bonus is if I want to use the same mirage in both Lann and Reynn's stacks, I can, because I have multiple copies. However, is there any value to having multiple copies? My Prism Case only stores 150 prisms, so there must be a limitation.






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