How many champions do I need to play ranked?

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Tags

1. #matches
2. #entering
3. #players
4. #provisional
5. #which
6. #ranked
7. #ladder
8. #champions
9. #summoners
10. #placed
11. #available
12. #selection
13. #level
14. #store
15. #draft
16. #purchased
17. #reached
18. #least