Upgrading Champions

I think that we should be able to upgrade champions, for example make a 4* into a 5*. This can be done by using shards on a maxed out champion to upgrade it to a higher star champion, keeping the previous power rating. Doing so would incentivise players to stick with a champion they like and would make champions more powerful if you stay with the champion longer because the starting power would be the same as the power before upgrading it.
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