Not everybody want to gather a lot of the 3* or duplicated costumes.
There is my idea.
Player might have possibility to convert useless costumes for summonig resources. I see some route to do this:
1 costume should be converted randomly to one of following:
- 1 wardrobe key
- 1 challenge event summon token
- 15 Atlantis coins
- 15 valhalla coins