So, i guess i should share this:
There is a way to farm gold incredibly fast, all you need are fast meele units and the big bomb stage, it works like this;
Equip Goblins, Dwarves, Phantoms, Tiger warriors, Valkyries, Mad bulls or Knights.
Have at least 2 fast heroes (Viegraff, Cassandra and Kara)
Have the shield spell and the altar upgraded as much as possible, this is still possible with the lowest ranks of both however.
Now...all you have to do is...rush, all out attack, from the start, this is fast and the only action on your part is to shield your characters as soon as the big bomb explodes.
The best part? This works for every difficulty, from normal to mythic and it gets faster and faster the more you upgrade your guys.
REAL GAME ADVICE; try to get Sylph at max level as soon as possible, their attack runs trough the whole battlefield, best possibility: it damages enemy castle, worst possibility: it kills some enemy adds
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