Hmm, I might buff it but as you already discovered the idea behind it is that even though it's a higher cost unit you can use it to get rid of low cost units with high penalties (such as greed, princess, or milita), you can use it to guard king to a degree, and you can use it to guard the promotion line to avoid the enemy turning around the battle last second. Part of what I was worried about with buffing is making it a unit that people just use to kill everything so they can win. Although I did add the bit about gaining morale on its death which discourages the opponent taking it, but I might upgrade the amount.