About gotg crystals and log in issue.

How many crystals should I open to get a 4* champ.?? I know it says it's a rare chance to get 3 or 4* but I've opened more than 50 and still keep opening but nothing. What's the point of collecting, playing and trying.
I've been playing this game for more than 2 years. I still don't have 4* Starlord or Guillotine or Wolverine which are I like the most. And there has been a chance to get a Starlord and we, android users have been kabamed. I've done over 1 million in a couple hours. Probably I won't be able to play long enough to reach first 800.
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