how tha hell am I supposed to buy champions?

aparently you need to get chests for an "easy" way of getting blue essence... but what if you can't get a chest? you simply don't get BE? I have 9 champions ffs and I can't improve that much on them to get an S so I get the POSSIBILITY of getting a chest, because a friend told me that even if you get an S it isn't guaranteed that you'll get it's chest... I can't even get a damn A-, how tha hell am I supposed to buy champions if the game doesn't even give me 1BE? my missions only give me either icons or XP, no BE at all!! is the game expecting me to waste real money buying something that always was free?
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