In a world that was completely based on sacrificial magic, how would the much life/mass would the object being sacrificed give? Would sacrificing a human able to bring back another human?
closed as primarily opinion-based by sphennings, JBH, L.Dutch♦, StephenG, Lee Leon Jan 16 '18 at 7:40
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Unless the magic is 100% efficient sacrificing one standard human isn't going to be enough recreate another from scratch, perhaps if you have the corpse of the person you're resurrecting that'll reduce the overhead somewhat, or if the person you're sacrificing is larger, younger or more powerful then they may be worth more towards the spell's cost.
If the magic is very inefficient you may need to sacrifice many people to resurrect one person.