There's a new indie RPG currently in development that looks promising.
It's called Halfling Wars. The entire game is built around raising and breeding elite fantasy creatures that you then battle against your friends online. You can make bets on the battles too. Bet your gold or even your creature!
But on top of that there's a deep questing system, back story, and simulation gameplay where you play as a Halfling or Darkling and grow rare crops/herbs, build a village, and mix potions in your apothecary. All of it is connected to empowering your creatures to gain glory in the battlefield.