The chance you get upped cards from fg's are small (depending on the deck of the fg)
You'd better farm gold if you can it will give you more

and when you get sspin you've got a big chance of getting an rare upped card, doesn't matter if you have six of them, selling them will give you some good

too.
If you want to play against false gods you'd better check your oracle and make a deck that has a high win percentage against that falsegod.
about the deck, you had way too much creatures which you had to power by 6 immolations 1 fire pend and 2 pillars
what you can do is post it when you made it and then people could give advice to make it better