spells hardly make a difference really
there is one super combo which works very well for mages
you will steam roll all and can concentrate on the sheer power of damage spells
and less on debuffing or buffing
1 guard droid stack and 2 repair droid stacks
reign damaging spells 2x then wait for them to do something
keep a slow stack or ranged stack alive to be able to revive all droids again
and GG no re
there is even an neklace that lets u get -20% leadership cost for droids
this army is perfect for slaughtering with high INT mage
an other option is 1 single stack EGD with invisibility cast upon it
or