Mound fiends do it fine. But they usually have better things to do.
I found a fun trick. Cast life after death with a bunch of independent priests in your army. If any get killed they come back as undead priests. Then you have cheap reanimators. It's not a game winning strategy but it's kind of fun.
I'm also wondering because i'm trying to flesh out a good undead strategy for LA Atlantis. If I get a few people doing reanimation then I get a couple dozen coral clad atlantean zombies every turn. Not quite a game winner but with the resource intensive Ice guards, expensive mournfuls and holy angakuts any extra troops are appreciated