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I hear ya, I always stay on Bronze but mostly because of lack of time but I'll try to get more focus on small chunks of time every day.
I recommend @bulldog1205 for video content and streams! He's a full-time SplinterPro to me lol he takes time to explain his card choices during games and how everything is going while battling plus video tutorials!
Risingstar is cool too! I am on that level that I keep doing the same mission that gives me more Starbits and rinse repeat lol

!PIZZA