I think that auto-grinding would be a fail. I honestly thought about making a bot to run a deck for me so I could auto-grind. I may even try to make one just to see if I can do it, even though it wouldn't be fair to use it. I like Marisa's (Higurashi) idea of Daily Quests. It would offer variety and allow for a nice gain. I don't know how starting an acount is now. I started before Sundial nerf so I had a FG Farmer with 60-70% win rate against FG's. It took me less than a week to fully up it and I had 90% win rate. I quit the game because it was too easy, but came back later. With that cash I built a grinder and tah-dah. If I didn't have that cash I may have cried and given up trying to make one.