(although, death is generally unnatural for me, so never mind about that knight)
Oh, I didn't think of that :D You're a paladin, so you use light! But you probably play with random units sometimes, then it will be useful :)
In my opinion, "balance" and "luck" in the game mean much more than the difference between a vampire and another level 3 unit!
There's also a big difference between a Djinn and other level 3 units.