Gold farming tips?

As the title suggests, I'm in dire need of gold and would love it if you all suggested your best tips and tricks to farm good amount of gold within a not so long period of time. Thanks in advance : )
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Also, if you're also in the position to do so, I save smaller crystals (PHCs, 3,4,5,GM, cavs, ultimate) so I can sell iso if I ever get really desperate.