Upgrade Idea by absorbing Lower Star Champs
As we progress through the game acquiring more 7* Champs, there is less use for lower star champs such as 1* and 2* champs. Therefore, it would be good if we could use the lower star champs as upgrades, as well as Iso and Catalysts.
For example, we can upgrade a 7* medusa using a 4* medusa by absorbing a certain percentage of resources from the 4* one. It should be a percentage like 80% or less because there is a cost in the conversion but still better than grinding to find all the resources.
There is also a trade-off as you lose the 4* medusa champ, that means you have one less champ available in the arena, quest or battleground etc.
Just an idea. If enough people like the idea then maybe Kabam can add this as a feature in a future release 👍