how do you dealing with black dragons as a mage ?

[MaelstorM]

I think we are talking about hard or imposible difficulty here

OK you see Black and Red dragons from valey of death
Theres few army there with (on hard) ~20 Blacks or ~35 Reds and ~1-2k level 1-2 monsters
You have 1 Dragon Sword, your best anti fire units highly probably dragons, demon, knight
With normal luck your leadership is 15-18k

Skeleton archer? what if your wife is mirabela / neoka and you dont have enough might rune to get the 1st round initiative bonus?
Black hole? at most you kill 3 Reds from each stack
Armagedon? if your spell does 2500 dmg, you'll lost your own Black
Trap? how about the other 2 dragons stacks?
Timeback? most probably you use this on your tank, but your archer also alredy left 4/5th by 2nd turn, and will not available again until the next 3 rounds
Phantom? you'll want to phantom your strongest unit, but the dragons will pound on your weakest

How can you win with no loss? On impossible?