[Cheezeninja]

I seem to recall another post where it was suggested you buff up your commanders that change shape when damaged, and then allow them to be damamged so you have a fireshielded/whatnot'ed giant spider causing havok.

Also spiders are good, even the cheap ones, give them orders to fire their webs and let them incapacitate and string out the enemy.

A search for machaka would probably yield a more comprehensive list of strategies, but thats what i remember from the top of my head from other Posts, never having played machaka myself.