I guess it's B) then. I'm sure you know that the unupped FG rainbow has a low winning percentage. I have fought FGs more than 50 times, but most of them are losses; it only gets harder with the improved AI, new FGs, and rainbow nerfs. I have won quite a few times, but I think in my entire gaming experience I've won less than 5 upgraded cards from FGs.
Remember the time period when Chriskang was making his FG challenges? Around that time we all thought Zanz abandoned this game, and there had been no new content in months. Back then Sundials were OP and AIs were terrible, so I should've grabbed my chance and grinded. But back then, I was so bored with the game that I nearly quit; the only thing that kept me from quitting was the forum.
Now Elements is fun again, but grinding became much harder. So yeah, I should've done the grinding when it was easy...
EDIT: Yeah, it really punches a hole in my good mood when I face Graviton who drops an Elite Otyugh in the second turn while I have a really bad draw with only 1 pillar. I'm not complaining, it's just my own luck...
EDIT 2: OK, won an upgraded card. Guess my luck is not so bad after all.
I'll start grinding again, but I doubt that before the matches start, I'll have a fully upped rainbow and Mono-Dark. I can't play on the weekdays.