Are 'trick' spells viable?

[Endoperez]

Nerfix said:
So, are 'trick' spells like False Fetters, Bonds of Fire, Rage and such viable in a serious game of Dominions II?

I have seen a Nataraja start killing my own units thanks to Rage. I didn't notice him being affected by it in the beginning, when there were enemy units around him, but when he started going for my archers... For a spell affecting only one unit, it can slow down or hurt surpisingly many units.

Those spells have their uses, but only in spesific cases. As an example, a strong enemy force can be slowed down, so that e.g. only few of the 15 knights reach your units in the first wave, and are massacred before the next few get to your units.