Table that combines distinct values ​​from different tables

Hello!

I have three tables in this structure:

Table1

Table2

Table3

I want to create a single reference table that will serve as a filter in my dashboard and will be responsible for filtering all tables (table1, table2 and table3). This new table will have all the distinct values ​​of the Level column of each table, just like this:

I created a new table in this format using this code:

UNION(VALUES(Table1[Level]), VALUES(Table2[Level]), VALUES(Table3[Level]))

However, when I try to relate this table to the tables from which it originates (table1, table2 and table3), I receive a circular dependency error.

How can I create a dynamic table that always has all the distinct values ​​of the Level column of each table so that I can relate to the tables and use it as a filter on my dashboard page?