In the game when you are added to a faction there should be a way of telling who is online in your faction, basically like facebook for example. This would make it easier to know when to start wars with other factions and raids since you would know how much support you would have. Thumb up if you think this would be a good idea.
Instead of only being able to refill using warbonds you should be able to replenish your energy with money you win from battles. There should also be upgrades or milestone upgrades like every five levels you gain 25 more energy or save up enough money and be able to upgrade the amount of energy you have.
To beat leaders with raider type cards use the imperial card Devastator
To beat blood thirsty nest use anti air and siege cards of any type
To beat leaders with Xeno type cards use the imperial card Valkyrie
To beat leaders using Imperial type cards use the raider cards Blitz armor and Furry Walker
Another all around card to use on all types that has a lot of success especially with the Imperial leader Thadius is the Tiamat card.