Incredibly common? Tell that to someone farming them legitimately without the use of a bot or coining. with a setup of 4 lvl 5s at each city it takes 150+ days sending waves once per hour 14 hours a day to reach a 15 star set. needless to say I stopped at 13 and a half.
The real reason its based on chance is to get a player to try an upgrade they can't afford to have fail on hope and then when it inevitably does they coin to regain what they had.




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