Before buying any of the big packs, I highly recommend trying to figure out how many speedups you're planning/willing to spend on the namecard event and SvS prep; it can massively change how many packs you need to buy to secure the permanent city skin.
This event is a prime example of how subjective the path to the skin reward can be. That complexity gets compounded by the Football King event, where you can use Gems and Speedups while chasing the permanent namecard, and by SvS prep overlapping the last few days, including troop training day.
Use the sliders below to enter the Speedups or Gems you already plan to spend in Football King and SvS prep, regardless of the Penalty Win event. Footballs from those planned uses are counted as free when calculating total cost.