There would be less micromanagement with Sanctify if you could cast it in a city so that it creates an effect that prevents hell terrain from spreading into the city radius / workable area and the effect stays until the caster leaves the city (similar to Wall of Stone, Hope and Inspire). Maybe it should clear all current hell terrain in the area too.
Otherwise it could work like it does now even though a general autocast possibility would be neat as well.
Otherwise it could work like it does now even though a general autocast possibility would be neat as well.