Let's make a catalog of good sac outlets for value. I feel like I'm missing some.
When you say you're looking for sac outlets, are you looking for repeatable effects (the traditional interpretation), multi-sac-for-value things, or just solid effects with the cost of sacrificing a critter strapped to them? I ask because considering the latter two open up your options pretty significantly. Take the following, for example. They're only once, but you can sac as many as you want and there's still some upside, especially in the case of Bontu.
Your opponent won't even have a chance to target it. The way the card is written allows you to plop it down and use it without passing priority to the opponent. It simply won't stay on the table, ever. For all intents and purporses it's a sorcery, not an enchanment.I dislike the fact it's almost untouchable, since you can sacrifice a creature and return it to your hand in response to an echantment-hate spell from your opponent.