Best way to get more Iso and Gold

ThomasE99

Hi, I need a good way to farm iso and gold as I need to rank up my stark Spidey and used all my iso on him. I can't get crystals often as I am FTP acct. Help

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Championcritic

no choice, if you really want gold and units must do arena.

ThomasE99

I got a lot of iso and I grind arenas every Tim im on. Anything else