I'm using game guardian to edit the value of mythical gems & you can speedhack too
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After you change the value of the mythical gems, you can unlimitedly summon "Epic to Mythical Monsters Summon" you want.
Example:
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I use gg feature "Edit Value" & "Speedhack" too get that 3 mythical monster with total 9 star (max level mean max bonus)
I want 3 again mythical monsters, but it's too hard like the percentage too get it just 0,01% even if use speedhack. Maybe luck has an effect too