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To be honest I don't know. Probably there are a lot of bots in Bronze so maybe it would not be that hard to hit Silver III. But on the other hand "only cards from starter pack" is much harder than "only lvl1 cards". I didn't even remember which cards starter pack contains ;-)

I've just been playing with one and getting to Bronze III is easy peasy. Going out now though so not able to take it any further. 😂