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I agree but I assume it would only be done for certain spells (preferably the ones that are PW original or the ones that can have multiple colors in HP canon).
This suggestion has been accepted and put on hold for the moment. The Arena Team is currently working on a new fun, QOL system that will include mentioned spells in this suggestion and much more! We hope once this is released the Arena Community will enjoy it.
Thank you for taking the time into creating your suggestion, we really appreciate it Tall!