What are some simple ways to earn gold/silver coins (gc/sc) in MD?

The simplest (and recently introduced) way is to be active, as consecutive active days get you some coins. Then, you can buy both silver and gold in the shop sections, although their exact position should be a spoiler. Participating into quests (and winning them, preferably) can land you plenty rewards, among which mr. money. Selling resources or creatures is another way, just like begging, which I haven't seen as of yet and don't recommend whatsoever. Money-lending isn't and shouldn't be a way. 

 

Here are the methods through which you may gain SCs, GCs and promissory notes for them:

• Via finding them in the shop
  • There exists a gold coin at the end of every shop category once emptied
  • They may appear amidst the roleplaying items you can buy
• Being given by another player
  • Via trading valuable possessions
  • By completing a quest and is given as quest rewards
  • By providing a service
  • By borrowing
  • By convincing/entertaining the other party
  • Etc.
• Via logging in consecutively.