Good luck :).

Keep in mind that you cant bring any units over level 3 if you are using the trick I mentioned above.

Also get either Gift or Phantom. Without either it can be tricky still.

Phantom is a much better choice for dryads because it requires much less mana (your dryad stack restores its sleep talent during sleep of phantom). But an alternative (possible for this fight too if I remember well) is just to use two stacks of Dryads, with one stack with only one Dryad.

The disadvantage of this last tactic is to require one free reserve slot and the fight is a little longer, the advantage is to require no mana care and allow focus on initiative problem with mass if you face opponent unit with higher initiative, not a problem with the Anga Ruby but can be one without it. Quote also the the Lena ball is queen with such tactic requiring attack every two turns.