[Suggestion] Death Ward spell should work on any unit I want, not just heroes

I mean, I'm a Life Arch Mage fer cryin' out loud, I can heal my whole stack in and out of combat.  Why can't this spell be used to protect my pet wolf?  She's a good girl with a gorgeous set of teeth, it's just her hit points are a little low, especially when 3 shamans casting Coal Stones are on yon hillock.

What's the point with heroes anyway?  They get an injury or two, no big whup.  Nothing a potion can't fix.