Average elixir cost : 3.1
About the spells (choose 2)
Since fireball is optional, you can replace it with rage. Rage is so good in supporting the giant and balloon.
Especially with the balloon, rage will fasten the bomb drop which normally takes a long time.
Fasten the moving bomb
Zap the swarmy for giant
never let the tanker walk alone
bats to counter building targeting