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Need suggestions how to play

I reached 33 level. But i don't have single 4 star hero. How to get 4 star hero or 4 star hero crystals?
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Other than that, you can try the premium hero crystals.
Also, once you have around 21 three stars at decent levels you can use them to grind for the 4star arena if you are still in the beginner bracket. I heard the last beginner cutoff was very very low for AA.
A time machine to yesterday and $30 ought to do it.