Walkthroughs for custom maps.

Map Name: Ira the Mage
Version: normal
Author: Liu Xuelian

How can I kill 20 sprites with one sniper on this map? Or should I lead them to Castle 21.10.0?
How can I kill 7 stacks of snipers with one sniper? If I use Forgetfulness, the computer kills me with a spell. If I use Antimagic, the snipers kill me.

I still need to kill the hero with the sprites. The question is, how can I do it without Tactics? Or do I need to get Tactics, but then what magic should I replace it with?