I'm lookin' for the same thing.
I've already achieve to "hack" shards, but only on appearence. I explain :
I've found the good adress, i've modify it from 50 to 5000, seems to work. But when i try to use it to buy an hero, it isn't working, same as if i hadn't all this shards. If i reload game, shards are back at 50.
Sorry for my bad english, i'm french.
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