[Campaign] Auxilary Sources of Gold

[Blake8]

Now I was thinking about this easier, but suppose you dont get a gold mine in a mission, or your gold mine doesnt have too much gold, what other sources could you use to get the funding needed for your army, I came up with some solutions, however more would be welcome.

1. Alchemist Crystals - Special crystals that give you a certain amount of gold per interval (using triggers) if they are if your possession
2. Bounty unit - A unit eliminating which gives you a huge bounty (anywhere from 500 to 1500 gold)
3. Pillage Ability
4. Unsummon building (undead only)
5. Creating a starfall ability that creates meteroids that act like gold coins or that can be sold to shops for gold
6. A special trigger that converts a certain amount of lumber to a certain amount of gold

Anyway as I've said more suggestions as well as any advice in general is welcome.