I wanted an "expensive but thorough" removal spell. I'm not sure if this should have been the more elegant "that dealt damage", but those are just depressing, so I went for the reasonably flavourful "attacked or dealt damage". Hopefully that's not too confusing.

May be too similar to divine verdict.

The ability to hit non-creatures will come up rarely, but it seems a natural bonus to be able to answer them when they do (including one or two terrains).

I went through several synonyms of "vendetta" and "vengeance" before deciding I could spend a one-word name on it :)