I actually think both of these cards are rather bad fits for our deck. We're a late game deck, we're not racing. That makes the drain from Unholy Fiend a real liability, and the alternative of a vanilla 1/1 for two is just terrible. I think Village Cannibals is a bit better, but with only four other humans it's certainly not a card I'm excited about. It does count opponents' creatures as well, though, and if it gets one counter it's about on par for a three drop.
I don't think we want to maindeck a second Manor Skeleton but I like having access to a second out of the board to help keep random werewolves from flipping and just having an early blocker against aggro decks. That's more likely to come up than the rare land cycle.
With only two rather crappy zombies to get back, I don't think Ghoulraiser is where we want to be. Night Terrors is a decent sideboard option and not completely awful to maindeck.