Just an update to the spreadsheet: added Card Level Data tab, with leveled data for every card, and a Card Comparison tab, where you can compare two cards, setting a level for each.
At the final lines there is a comparison of hitpoint and damage per elixir cost. I added an exponential factor for the elixir cost because too expensive cards mean too much time waiting for the amount of elixir needed; if the opposing player attacks, you have to decide between waiting further and risking the loss of a tower, or using a defensive card and having to wait for the elixir again.
Any input on improvements would be much appreciated.
Here is the link:
https://docs.google.com/spreadsheets/d/1VTsbsUSjqN7hDjrB5EiSsNu79br3OW0HUK3I1VEV5WQ/edit?usp=sharing