It seems to me like wasting runes on trading and trophies will just weaken you in the long run. I had millions of extra gold (w/o any points in trading or trophies until the end, when I had more mind runes than I could spend) on impossible with my Mage. If you are real concerned about money, you can just incorporate Marauders into your army.
Your starting army should probably be Archers, Priests, Inquisitors (if available)/Evil Eyes, Horsemen/Royal Snakes, Archmagi.
The problem with impossible is that you will have to spend a ton of time trying to sneak by everything to pick up rewards before you have a chance at killing it. Technically, you can get Demon Gate as soon as you have access to the Dwarf area (by sneaking around in the Demon world).
One big piece of advice is to save most of the easy, low exp battles for later on when you have the skull (essential) and other items that are activated by # of battles won.
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