Best Konquest mode

I've played all three games(Deadly Alliance,Deception,Armageddon),and I have to say that this game's Konquest mode is the best.Think about it:
1.You can't get killed.
2.You follow a story.
3.You win coins throughout the entire thing.
Need I say more?
P.S. I'm trying to get enough coins to unlock the Palace Grounds Arena.Any way I can make about 4000 Sapphire coins very quickly?