@ Drambuie,
With all those level 4-5 units, all you need to do is spam your "Fear" spell. On the first round, try to kill Zig Zag's 2 trolls with fire arrow or something, then start casting "Fear" on all the remaining stacks. (Do you have higher magic?)
Once all of Zog Zag's units are under the influence of the "Fear" spell, he won't be able to have his turn and therefore won't be able to cast "Geyser" and "lightening".
