You have some amazing troops for your level.
It is very difficult to win high level event battles without an armour ripping weapon. Specially before you have a stronger deck. MANG is the most obvious option and you have it, you can also go to weapons and write armor in sorter to view your options. You can add a hero/weapon to any team.
In the short term I would suggest 3x dwarven gate and Lady Ironbeard in third slot. When first DG is full and second half full you start casting.
When opponent reaches too high level for this team add Mang first and move LI to the bottom.
You have Divine Ishbaala so you might work on traiting her, once she is fully traited go to sorter and pick divine, and make a team around her. You will probably have more troops by then.
You also have some good goblins so a goblin team might be an option.
The default team to farm traitstones is
Sunbird-Hero-2xfirebomb (firebomb has to be fully traited)
Before Rowanne was in place of hero.
If we gain more gold/souls/traitstones by using a certain card in explore I add that card in place of hero.
Then I would suggest you join a guild where you can ask for advice, and gain tons of keys