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The current structure of your data will prevent you from making such changes with a single function. Tableau works best with one value per row, in other words it likes long data set rather than a wide one with many columns. If you pivot the data using these steps Pivot Data from Columns to Rows - Tableau, you will obtain a single column with all team names and will be able to colour it just as you want.
Let me know if you need any further help.