Water Diviner it's cool if you look for a quick suicidal battle and you expect the rival not to have anti magic, I usually combine it with Shock Trooper, placing it in the back it's probably because I was looking to tank any sneak attack with him, usually the Shock Trooper goes in 2nd place (unless it's back to basics that would go last probably).

The idea it's to place 2 or 3 quick hits and sacrifice the unit.