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Where do F2P get ISOs from?

I'm F2P and hardly open 4 4* crystals and 2 5* crysals per month. I need 3 months to take up a 5* to Max level with all the resources available. So just wanted to know will KaBoom ever solve this problem?
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So the iso problem is there, but at this case you are not working hard for it because you need 3 months to max out a 5*?
As said above, arena is king.